RHSA-2026:34975
Vulnerability from csaf_redhat - Published: 2026-07-02 15:43 - Updated: 2026-07-03 21:09Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Critical
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
rust:
* cargo-1.96.1-1.hum1 (aarch64, x86_64)
* clippy-1.96.1-1.hum1 (aarch64, x86_64)
* rust-1.96.1-1.hum1 (aarch64, x86_64)
* rust-analyzer-1.96.1-1.hum1 (aarch64, x86_64)
* rust-debugger-common-1.96.1-1.hum1 (noarch)
* rust-doc-1.96.1-1.hum1 (aarch64, x86_64)
* rust-gdb-1.96.1-1.hum1 (noarch)
* rust-lldb-1.96.1-1.hum1 (noarch)
* rust-src-1.96.1-1.hum1 (noarch)
* rust-std-static-1.96.1-1.hum1 (aarch64, x86_64)
* rust-std-static-aarch64-unknown-none-softfloat-1.96.1-1.hum1 (noarch)
* rust-std-static-aarch64-unknown-uefi-1.96.1-1.hum1 (noarch)
* rust-std-static-i686-pc-windows-gnu-1.96.1-1.hum1 (noarch)
* rust-std-static-wasm32-unknown-unknown-1.96.1-1.hum1 (noarch)
* rust-std-static-wasm32-wasip1-1.96.1-1.hum1 (noarch)
* rust-std-static-x86_64-pc-windows-gnu-1.96.1-1.hum1 (noarch)
* rust-std-static-x86_64-unknown-none-1.96.1-1.hum1 (noarch)
* rust-std-static-x86_64-unknown-uefi-1.96.1-1.hum1 (noarch)
* rustfmt-1.96.1-1.hum1 (aarch64, x86_64)
* rust-1.96.1-1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in WEBrick, a Ruby web server toolkit. This vulnerability allows a remote attacker to perform request smuggling by manipulating the Content-Length header in HTTP/1.1 requests. WEBrick incorrectly re-parses the trailer Content-Length, leading to a desynchronization between the proxy and the backend server. This desynchronization can enable an attacker to bypass security controls, access unauthorized information, or inject malicious requests.
6.5 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:rust-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:rust-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:rust-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:rust-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Critical
References
26 references
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"vulnerabilities": [
{
"cve": "CVE-2026-38969",
"cwe": {
"id": "CWE-444",
"name": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)"
},
"discovery_date": "2026-07-02T22:01:02.906970+00:00",
"ids": [
{
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"text": "2496708"
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],
"notes": [
{
"category": "description",
"text": "A flaw was found in WEBrick, a Ruby web server toolkit. This vulnerability allows a remote attacker to perform request smuggling by manipulating the Content-Length header in HTTP/1.1 requests. WEBrick incorrectly re-parses the trailer Content-Length, leading to a desynchronization between the proxy and the backend server. This desynchronization can enable an attacker to bypass security controls, access unauthorized information, or inject malicious requests.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "webrick: rubygem-webrick: WEBrick: Request smuggling via re-parsing of Content-Length header",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A flaw was found in WEBrick\u0027s chunked transfer encoding parser. When processing HTTP chunked requests, WEBrick reparses trailer fields into the main request header map without filtering. An attacker can inject a forged Content-Length value via chunked trailers, which is then exposed through req[\u0027content-length\u0027] and req.meta_vars[\u0027CONTENT_LENGTH\u0027]. Applications that trust this metadata for security-relevant decisions (e.g., body size validation, request routing) may be susceptible to request smuggling or incorrect request processing. Note that WEBrick is not intended for production use \u2014 its own documentation recommends using a production-grade server such as Puma or Unicorn for internet-facing deployments.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"fixed": [
"Red Hat Hardened Images:rust-main@aarch64",
"Red Hat Hardened Images:rust-main@noarch",
"Red Hat Hardened Images:rust-main@src",
"Red Hat Hardened Images:rust-main@x86_64"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496708"
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"summary": "https://www.cve.org/CVERecord?id=CVE-2026-38969",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-38969"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-38969",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-38969"
},
{
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"summary": "https://github.com/advisories/GHSA-h4w6-wx8r-p68v",
"url": "https://github.com/advisories/GHSA-h4w6-wx8r-p68v"
},
{
"category": "external",
"summary": "https://github.com/ruby/webrick/issues/198",
"url": "https://github.com/ruby/webrick/issues/198"
},
{
"category": "external",
"summary": "https://github.com/ruby/webrick/pull/199",
"url": "https://github.com/ruby/webrick/pull/199"
}
],
"release_date": "2026-07-02T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-02T15:43:28+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:rust-main@aarch64",
"Red Hat Hardened Images:rust-main@noarch",
"Red Hat Hardened Images:rust-main@src",
"Red Hat Hardened Images:rust-main@x86_64"
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"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2026:34975"
},
{
"category": "workaround",
"details": "Do not expose WEBrick directly to untrusted network traffic. WEBrick is not designed for production use and should be replaced with a production-grade Ruby application server (e.g., Puma, Unicorn) behind a reverse proxy (e.g., nginx, Apache, HAProxy) that performs its own Content-Length validation and strips or rejects requests with conflicting transfer encoding headers.\n\nA patch is available: https://github.com/ruby/webrick/pull/199",
"product_ids": [
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"Red Hat Hardened Images:rust-main@noarch",
"Red Hat Hardened Images:rust-main@src",
"Red Hat Hardened Images:rust-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:rust-main@aarch64",
"Red Hat Hardened Images:rust-main@noarch",
"Red Hat Hardened Images:rust-main@src",
"Red Hat Hardened Images:rust-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Critical"
}
],
"title": "webrick: rubygem-webrick: WEBrick: Request smuggling via re-parsing of Content-Length header"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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