RHSA-2026:54650
Vulnerability from csaf_opensuse - Published: 2026-08-13 18:49 - Updated: 2026-09-29 00:23Summary
Red Hat Security Advisory: nghttp2 security update
Severity
Moderate
Notes
Topic: An update for nghttp2 is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: libnghttp2 is a library implementing the Hypertext Transfer Protocol version 2 (HTTP/2) protocol in C.
Security Fix(es):
* nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests (CVE-2026-58055)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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 in nghttp2's nghttpx proxy allows a remote attacker to perform HTTP request smuggling and cross-client response-queue poisoning. This occurs because the proxy ambiguously forwards HTTP/1.1 Upgrade requests that contain a Content-Length header to reusable keep-alive backend connections.
5.4 (Medium)
Affected products
Fixed
49 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libnghttp2-devel-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libnghttp2-devel-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libnghttp2-devel-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:libnghttp2-devel-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libnghttp2-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libnghttp2-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libnghttp2-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libnghttp2-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-0:1.68.0-3.el10_2.2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:libnghttp2-debuginfo-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-debuginfo-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:nghttp2-debugsource-0:1.68.0-3.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
11 references
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests"
}
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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.
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.
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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.
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