RHSA-2026:38009
Vulnerability from csaf_redhat - Published: 2026-07-10 17:41 - Updated: 2026-11-07 05:57A flaw was found in undici. An attacker-controlled upstream server can exploit a vulnerability in Undici's HTTP/1.1 client, specifically related to response queue poisoning on reused keep-alive sockets. This allows the attacker to inject an unsolicited HTTP/1.1 response onto an idle socket. Consequently, when the client dispatches a new request on that socket, it may associate the injected response with the new request, leading to responses being delivered to unintended recipients or requests. This could result in a low impact on data integrity.
CWE-940 - Improper Verification of Source of a Communication Channel| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:nodejs26-1:26.5.0-1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: Red Hat Hardened Images:nodejs26-1:26.5.0-1.3.hum1@src | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: Red Hat Hardened Images:nodejs26-1:26.5.0-1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
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| Unresolved product id: Red Hat Hardened Images:nodejs26-bin-1:26.5.0-1.3.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
Workaround
|
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| Unresolved product id: Red Hat Hardened Images:nodejs26-bin-1:26.5.0-1.3.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
Workaround
|
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| Unresolved product id: Red Hat Hardened Images:nodejs26-devel-1:26.5.0-1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: Red Hat Hardened Images:nodejs26-devel-1:26.5.0-1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-docs-1:26.5.0-1.3.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-docs-1:26.5.0-1.3.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-full-i18n-1:26.5.0-1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-full-i18n-1:26.5.0-1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-libs-1:26.5.0-1.3.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-libs-1:26.5.0-1.3.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-npm-1:11.17.0-1.26.5.0.1.3.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-npm-1:11.17.0-1.26.5.0.1.3.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-npm-bin-1:26.5.0-1.3.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nodejs26-npm-bin-1:26.5.0-1.3.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
Workaround
|
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:v8-14.6-devel-3:14.6.202.34-1.26.5.0.1.3.hum1@aarch64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:v8-14.6-devel-3:14.6.202.34-1.26.5.0.1.3.hum1@x86_64 | — |
Workaround
|
A flaw was found in undici. The cookie parser in the `parseSetCookie` function incorrectly decodes cookie values, which is contrary to standard specifications. This vulnerability allows an attacker-controlled upstream to inject arbitrary HTTP response headers, such as `Set-Cookie`, `Location`, or `Cache-Control`. The primary consequence is HTTP response header injection, which can lead to session fixation, open redirect, or cache poisoning.
A flaw was found in undici. A malicious WebSocket server can exploit this by streaming numerous small or empty continuation frames. This can bypass per-frame and cumulative-size validation, leading to unbounded memory growth in the client process. The primary consequence is memory exhaustion, resulting in a denial of service (DoS) for affected applications using the undici WebSocket client or WebSocketStream API.
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"Red Hat Hardened Images:v8-14.6-devel-3:14.6.202.34-1.26.5.0.1.3.hum1@aarch64",
"Red Hat Hardened Images:v8-14.6-devel-3:14.6.202.34-1.26.5.0.1.3.hum1@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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"Red Hat Hardened Images:nodejs26-1:26.5.0-1.3.hum1@src",
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"Red Hat Hardened Images:nodejs26-bin-1:26.5.0-1.3.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:nodejs26-bin-1:26.5.0-1.3.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:nodejs26-devel-1:26.5.0-1.3.hum1@aarch64",
"Red Hat Hardened Images:nodejs26-devel-1:26.5.0-1.3.hum1@x86_64",
"Red Hat Hardened Images:nodejs26-docs-1:26.5.0-1.3.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:nodejs26-docs-1:26.5.0-1.3.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:nodejs26-full-i18n-1:26.5.0-1.3.hum1@aarch64",
"Red Hat Hardened Images:nodejs26-full-i18n-1:26.5.0-1.3.hum1@x86_64",
"Red Hat Hardened Images:nodejs26-libs-1:26.5.0-1.3.hum1@aarch64",
"Red Hat Hardened Images:nodejs26-libs-1:26.5.0-1.3.hum1@x86_64",
"Red Hat Hardened Images:nodejs26-npm-1:11.17.0-1.26.5.0.1.3.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:nodejs26-npm-1:11.17.0-1.26.5.0.1.3.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:nodejs26-npm-bin-1:26.5.0-1.3.hum1@noarch@public-hummingbird-aarch64-rpms",
"Red Hat Hardened Images:nodejs26-npm-bin-1:26.5.0-1.3.hum1@noarch@public-hummingbird-x86_64-rpms",
"Red Hat Hardened Images:v8-14.6-devel-3:14.6.202.34-1.26.5.0.1.3.hum1@aarch64",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "undici: undici: Denial of Service due to unbounded memory growth via WebSocket frames"
}
]
}
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.