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Require CRLF line endings in request line and headers #138

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merged 1 commit into from
Jul 2, 2024

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jeremyevans
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Disallow bare CR, LF, NUL in header and request lines. Tighten parsing of request lines to only allow single spaces, as specified in the RFCs.

Forcing this RFC-compliant behavior breaks a lot of tests, so fix the tests to correctly use CRLF instead of LF for requests (other than the specific checks for handling of bad requests).

Fixes #137

Disallow bare CR, LF, NUL in header and request lines. Tighten
parsing of request lines to only allow single spaces, as specified
in the RFCs.

Forcing this RFC-compliant behavior breaks a lot of tests, so
fix the tests to correctly use CRLF instead of LF for requests
(other than the specific checks for handling of bad requests).

Fixes ruby#137
@@ -458,7 +458,7 @@ def read_request_line(socket)
end

@request_time = Time.now
if /^(\S+)\s+(\S++)(?:\s+HTTP\/(\d+\.\d+))?\r?\n/mo =~ @request_line
if /^(\S+) (\S++)(?: HTTP\/(\d+\.\d+))?\r\n/mo =~ @request_line
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I think the old behavior is technically RFC-compliant.

RFC 9112 section 3:

Although the request-line grammar rule requires that each of the component elements be separated by a single SP octet, recipients MAY instead parse on whitespace-delimited word boundaries and, aside from the CRLF terminator, treat any form of whitespace as the SP separator while ignoring preceding or trailing whitespace; such whitespace includes one or more of the following octets: SP, HTAB, VT (%x0B), FF (%x0C), or bare CR. However, lenient parsing can result in request smuggling security vulnerabilities if there are multiple recipients of the message and each has its own unique interpretation of robustness (see Section 11.2).

That said, this isn't a bad change. Apache rejects request lines that use whitespace other than a single SP octet, so I don't think you'll break compatibility with any clients by tightening this up.

@@ -471,7 +471,7 @@ def read_request_line(socket)
def read_header(socket)
if socket
while line = read_line(socket)
break if /\A(#{CRLF}|#{LF})\z/om =~ line
break if /\A#{CRLF}\z/om =~ line
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Similarly, breaking lines on bare LF is allowed by the RFCs, so the old behavior was not a violation. From RFC 9112, section 2.2:

Although the line terminator for the start-line and fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR.

Again, many popular servers (Apache, Lighttpd, Node.js, Passenger, Puma) require CRLF line endings, so you're unlikely to break compatibility by joining that club.

@jeremyevans
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@kenballus Thank you very much for your review. Since the RFCs do not require (MAY not MUST) the loose behavior, I would feel better about making things strict in order to reduce the chance of security issues, especially since other web servers are similarly strict.

@kenballus
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Agreed. LGTM.

@@ -11,7 +11,7 @@ def teardown

def test_simple_request
msg = <<-_end_of_message_
GET /
GET /\r
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Shouldn't this be \r\n?

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The \n comes from the line ending (it's a heredoc).

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Ah got it!

@@ -77,7 +77,7 @@ def test_request_uri_too_large
_end_of_message_
req = WEBrick::HTTPRequest.new(WEBrick::Config::HTTP)
assert_raise(WEBrick::HTTPStatus::RequestURITooLarge){
req.parse(StringIO.new(msg.gsub(/^ {6}/, "")))
req.parse(StringIO.new(msg.gsub(/^ {6}/, "").gsub("\n", "\r\n")))
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There is a lot of duplicated setup. Would it make sense to extract it into a helper? Or use <<~ instead?

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Sure. If someone wants to work on cleaning up the specs in a later PR, that would be great.

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Basically looks okay to me, but these tests look kind of crufty in general (not the fault of the PR).

@jeremyevans jeremyevans merged commit ee60354 into ruby:master Jul 2, 2024
19 checks passed
andrewpollock pushed a commit to google/osv.dev that referenced this pull request Sep 24, 2024
This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [webrick](https://redirect.github.com/ruby/webrick) | `1.8.1` ->
`1.8.2` |
[![age](https://developer.mend.io/api/mc/badges/age/rubygems/webrick/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/rubygems/webrick/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/rubygems/webrick/1.8.1/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/rubygems/webrick/1.8.1/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### HTTP Request Smuggling in ruby webrick
[CVE-2024-47220](https://nvd.nist.gov/vuln/detail/CVE-2024-47220) /
[GHSA-6f62-3596-g6w7](https://redirect.github.com/advisories/GHSA-6f62-3596-g6w7)

<details>
<summary>More information</summary>

#### Details
An issue was discovered in the WEBrick toolkit through 1.8.1 for Ruby.
It allows HTTP request smuggling by providing both a Content-Length
header and a Transfer-Encoding header, e.g., "GET /admin HTTP/1.1\r\n"
inside of a "POST /user HTTP/1.1\r\n" request. NOTE: the supplier's
position is "Webrick should not be used in production."

#### Severity
- CVSS Score: 7.5 / 10 (High)
- Vector String: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`

#### References
-
[https://nvd.nist.gov/vuln/detail/CVE-2024-47220](https://nvd.nist.gov/vuln/detail/CVE-2024-47220)
-
[ruby/webrick#145
-
[https://github.com/ruby/webrick/pull/146/commits/d88321da45dcd230ac2b4585cad4833d6d5e8841](https://redirect.github.com/ruby/webrick/pull/146/commits/d88321da45dcd230ac2b4585cad4833d6d5e8841)
-
[https://github.com/ruby/webrick/commit/f5faca9222541591e1a7c3c97552ebb0c92733c7](https://redirect.github.com/ruby/webrick/commit/f5faca9222541591e1a7c3c97552ebb0c92733c7)
-
[https://github.com/ruby/webrick](https://redirect.github.com/ruby/webrick)

This data is provided by
[OSV](https://osv.dev/vulnerability/GHSA-6f62-3596-g6w7) and the [GitHub
Advisory Database](https://redirect.github.com/github/advisory-database)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>ruby/webrick (webrick)</summary>

###
[`v1.8.2`](https://redirect.github.com/ruby/webrick/releases/tag/v1.8.2)

[Compare
Source](https://redirect.github.com/ruby/webrick/compare/v1.8.1...v1.8.2)

#### What's Changed

- Drop commented-out line by
[@&#8203;olleolleolle](https://redirect.github.com/olleolleolle) in
[ruby/webrick#108
- Add Ruby 3.1 & 3.2 to CI matrix by
[@&#8203;tricknotes](https://redirect.github.com/tricknotes) in
[ruby/webrick#109
- Fix/redos by
[@&#8203;ooooooo-q](https://redirect.github.com/ooooooo-q) in
[ruby/webrick#114
- Raise HTTPStatus::BadRequest for requests with invalid/duplicate
content-length headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#120
- Bump actions/checkout from 3 to 4 by
[@&#8203;dependabot](https://redirect.github.com/dependabot) in
[ruby/webrick#121
- Improve CI by [@&#8203;hsbt](https://redirect.github.com/hsbt) in
[ruby/webrick#123
- Fix WEBrick::TestFileHandler#test_short_filename test not working on
mswin by
[@&#8203;KJTsanaktsidis](https://redirect.github.com/KJTsanaktsidis) in
[ruby/webrick#128
- Fix bug chunk extension detection by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#125
- Fix CI. by [@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#131
- Merge multiple cookie headers, preserving semantic correctness. by
[@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#130
- Test on macos-latest by
[@&#8203;byroot](https://redirect.github.com/byroot) in
[ruby/webrick#132
- Require CRLF line endings in request line and headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#138
- Prefer squigly heredocs. by
[@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#143
- Only strip space and horizontal tab in headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#141
- Treat missing CRLF separator after headers as an EOFError by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#142
- Return 400 response for chunked requests with unexpected data after
chunk by [@&#8203;jeremyevans](https://redirect.github.com/jeremyevans)
in
[ruby/webrick#136
- Fix reference to URI::REGEXP::PATTERN::HOST by
[@&#8203;casperisfine](https://redirect.github.com/casperisfine) in
[ruby/webrick#144
- Prevent request smuggling by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#146

#### New Contributors

- [@&#8203;tricknotes](https://redirect.github.com/tricknotes) made
their first contribution in
[ruby/webrick#109
- [@&#8203;ooooooo-q](https://redirect.github.com/ooooooo-q) made their
first contribution in
[ruby/webrick#114
- [@&#8203;KJTsanaktsidis](https://redirect.github.com/KJTsanaktsidis)
made their first contribution in
[ruby/webrick#128
- [@&#8203;byroot](https://redirect.github.com/byroot) made their first
contribution in
[ruby/webrick#132
- [@&#8203;casperisfine](https://redirect.github.com/casperisfine) made
their first contribution in
[ruby/webrick#144

**Full Changelog**:
ruby/webrick@v1.8.1...v1.8.2

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "" in timezone Australia/Sydney,
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/google/osv.dev).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC44MC4wIiwidXBkYXRlZEluVmVyIjoiMzguODAuMCIsInRhcmdldEJyYW5jaCI6Im1hc3RlciIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiXX0=-->
andrewpollock pushed a commit to google/osv-scanner that referenced this pull request Sep 24, 2024
This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [webrick](https://redirect.github.com/ruby/webrick) | `1.8.1` ->
`1.8.2` |
[![age](https://developer.mend.io/api/mc/badges/age/rubygems/webrick/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/rubygems/webrick/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/rubygems/webrick/1.8.1/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/rubygems/webrick/1.8.1/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### HTTP Request Smuggling in ruby webrick
[CVE-2024-47220](https://nvd.nist.gov/vuln/detail/CVE-2024-47220) /
[GHSA-6f62-3596-g6w7](https://redirect.github.com/advisories/GHSA-6f62-3596-g6w7)

<details>
<summary>More information</summary>

#### Details
An issue was discovered in the WEBrick toolkit through 1.8.1 for Ruby.
It allows HTTP request smuggling by providing both a Content-Length
header and a Transfer-Encoding header, e.g., "GET /admin HTTP/1.1\r\n"
inside of a "POST /user HTTP/1.1\r\n" request. NOTE: the supplier's
position is "Webrick should not be used in production."

#### Severity
- CVSS Score: 7.5 / 10 (High)
- Vector String: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`

#### References
-
[https://nvd.nist.gov/vuln/detail/CVE-2024-47220](https://nvd.nist.gov/vuln/detail/CVE-2024-47220)
-
[ruby/webrick#145
-
[https://github.com/ruby/webrick/pull/146/commits/d88321da45dcd230ac2b4585cad4833d6d5e8841](https://redirect.github.com/ruby/webrick/pull/146/commits/d88321da45dcd230ac2b4585cad4833d6d5e8841)
-
[https://github.com/ruby/webrick/commit/f5faca9222541591e1a7c3c97552ebb0c92733c7](https://redirect.github.com/ruby/webrick/commit/f5faca9222541591e1a7c3c97552ebb0c92733c7)
-
[https://github.com/ruby/webrick](https://redirect.github.com/ruby/webrick)

This data is provided by
[OSV](https://osv.dev/vulnerability/GHSA-6f62-3596-g6w7) and the [GitHub
Advisory Database](https://redirect.github.com/github/advisory-database)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>ruby/webrick (webrick)</summary>

###
[`v1.8.2`](https://redirect.github.com/ruby/webrick/releases/tag/v1.8.2)

[Compare
Source](https://redirect.github.com/ruby/webrick/compare/v1.8.1...v1.8.2)

#### What's Changed

- Drop commented-out line by
[@&#8203;olleolleolle](https://redirect.github.com/olleolleolle) in
[ruby/webrick#108
- Add Ruby 3.1 & 3.2 to CI matrix by
[@&#8203;tricknotes](https://redirect.github.com/tricknotes) in
[ruby/webrick#109
- Fix/redos by
[@&#8203;ooooooo-q](https://redirect.github.com/ooooooo-q) in
[ruby/webrick#114
- Raise HTTPStatus::BadRequest for requests with invalid/duplicate
content-length headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#120
- Bump actions/checkout from 3 to 4 by
[@&#8203;dependabot](https://redirect.github.com/dependabot) in
[ruby/webrick#121
- Improve CI by [@&#8203;hsbt](https://redirect.github.com/hsbt) in
[ruby/webrick#123
- Fix WEBrick::TestFileHandler#test_short_filename test not working on
mswin by
[@&#8203;KJTsanaktsidis](https://redirect.github.com/KJTsanaktsidis) in
[ruby/webrick#128
- Fix bug chunk extension detection by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#125
- Fix CI. by [@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#131
- Merge multiple cookie headers, preserving semantic correctness. by
[@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#130
- Test on macos-latest by
[@&#8203;byroot](https://redirect.github.com/byroot) in
[ruby/webrick#132
- Require CRLF line endings in request line and headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#138
- Prefer squigly heredocs. by
[@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#143
- Only strip space and horizontal tab in headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#141
- Treat missing CRLF separator after headers as an EOFError by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#142
- Return 400 response for chunked requests with unexpected data after
chunk by [@&#8203;jeremyevans](https://redirect.github.com/jeremyevans)
in
[ruby/webrick#136
- Fix reference to URI::REGEXP::PATTERN::HOST by
[@&#8203;casperisfine](https://redirect.github.com/casperisfine) in
[ruby/webrick#144
- Prevent request smuggling by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#146

#### New Contributors

- [@&#8203;tricknotes](https://redirect.github.com/tricknotes) made
their first contribution in
[ruby/webrick#109
- [@&#8203;ooooooo-q](https://redirect.github.com/ooooooo-q) made their
first contribution in
[ruby/webrick#114
- [@&#8203;KJTsanaktsidis](https://redirect.github.com/KJTsanaktsidis)
made their first contribution in
[ruby/webrick#128
- [@&#8203;byroot](https://redirect.github.com/byroot) made their first
contribution in
[ruby/webrick#132
- [@&#8203;casperisfine](https://redirect.github.com/casperisfine) made
their first contribution in
[ruby/webrick#144

**Full Changelog**:
ruby/webrick@v1.8.1...v1.8.2

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "" in timezone Australia/Sydney,
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/google/osv-scanner).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC44MC4wIiwidXBkYXRlZEluVmVyIjoiMzguODAuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiZGVwZW5kZW5jaWVzIl19-->
marcelamelara pushed a commit to slsa-framework/slsa that referenced this pull request Sep 24, 2024
This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [webrick](https://redirect.github.com/ruby/webrick) | `1.8.1` ->
`1.8.2` |
[![age](https://developer.mend.io/api/mc/badges/age/rubygems/webrick/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/rubygems/webrick/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/rubygems/webrick/1.8.1/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/rubygems/webrick/1.8.1/1.8.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

### GitHub Vulnerability Alerts

#### [CVE-2024-47220](https://nvd.nist.gov/vuln/detail/CVE-2024-47220)

An issue was discovered in the WEBrick toolkit through 1.8.1 for Ruby.
It allows HTTP request smuggling by providing both a Content-Length
header and a Transfer-Encoding header, e.g., "GET /admin HTTP/1.1\r\n"
inside of a "POST /user HTTP/1.1\r\n" request. NOTE: the supplier's
position is "Webrick should not be used in production."

---

### Release Notes

<details>
<summary>ruby/webrick (webrick)</summary>

###
[`v1.8.2`](https://redirect.github.com/ruby/webrick/releases/tag/v1.8.2)

[Compare
Source](https://redirect.github.com/ruby/webrick/compare/v1.8.1...v1.8.2)

#### What's Changed

- Drop commented-out line by
[@&#8203;olleolleolle](https://redirect.github.com/olleolleolle) in
[ruby/webrick#108
- Add Ruby 3.1 & 3.2 to CI matrix by
[@&#8203;tricknotes](https://redirect.github.com/tricknotes) in
[ruby/webrick#109
- Fix/redos by
[@&#8203;ooooooo-q](https://redirect.github.com/ooooooo-q) in
[ruby/webrick#114
- Raise HTTPStatus::BadRequest for requests with invalid/duplicate
content-length headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#120
- Bump actions/checkout from 3 to 4 by
[@&#8203;dependabot](https://redirect.github.com/dependabot) in
[ruby/webrick#121
- Improve CI by [@&#8203;hsbt](https://redirect.github.com/hsbt) in
[ruby/webrick#123
- Fix WEBrick::TestFileHandler#test_short_filename test not working on
mswin by
[@&#8203;KJTsanaktsidis](https://redirect.github.com/KJTsanaktsidis) in
[ruby/webrick#128
- Fix bug chunk extension detection by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#125
- Fix CI. by [@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#131
- Merge multiple cookie headers, preserving semantic correctness. by
[@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#130
- Test on macos-latest by
[@&#8203;byroot](https://redirect.github.com/byroot) in
[ruby/webrick#132
- Require CRLF line endings in request line and headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#138
- Prefer squigly heredocs. by
[@&#8203;ioquatix](https://redirect.github.com/ioquatix) in
[ruby/webrick#143
- Only strip space and horizontal tab in headers by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#141
- Treat missing CRLF separator after headers as an EOFError by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#142
- Return 400 response for chunked requests with unexpected data after
chunk by [@&#8203;jeremyevans](https://redirect.github.com/jeremyevans)
in
[ruby/webrick#136
- Fix reference to URI::REGEXP::PATTERN::HOST by
[@&#8203;casperisfine](https://redirect.github.com/casperisfine) in
[ruby/webrick#144
- Prevent request smuggling by
[@&#8203;jeremyevans](https://redirect.github.com/jeremyevans) in
[ruby/webrick#146

#### New Contributors

- [@&#8203;tricknotes](https://redirect.github.com/tricknotes) made
their first contribution in
[ruby/webrick#109
- [@&#8203;ooooooo-q](https://redirect.github.com/ooooooo-q) made their
first contribution in
[ruby/webrick#114
- [@&#8203;KJTsanaktsidis](https://redirect.github.com/KJTsanaktsidis)
made their first contribution in
[ruby/webrick#128
- [@&#8203;byroot](https://redirect.github.com/byroot) made their first
contribution in
[ruby/webrick#132
- [@&#8203;casperisfine](https://redirect.github.com/casperisfine) made
their first contribution in
[ruby/webrick#144

**Full Changelog**:
ruby/webrick@v1.8.1...v1.8.2

</details>

---

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---

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---

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