Vulnerability-Lookup

RHSA-2026:52414

Vulnerability from csaf_redhat - Published: 2026-08-10 01:09 - Updated: 2026-10-05 18:17

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: nghttp2: * libnghttp2-1.69.0-5.hum1 (aarch64, x86_64) * libnghttp2-devel-1.69.0-5.hum1 (aarch64, x86_64) * mingw32-libnghttp2-1.69.0-5.hum1 (aarch64, x86_64) * mingw64-libnghttp2-1.69.0-5.hum1 (aarch64, x86_64) * nghttp2-1.69.0-5.hum1 (aarch64, x86_64) * nghttp2-1.69.0-5.hum1.src (src) Security Fix(es): nghttp2: * CVE-2026-58055

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.

CVE-2026-58055

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)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected products

Fixed 11 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:libnghttp2-0:1.69.0-5.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:libnghttp2-0:1.69.0-5.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:libnghttp2-devel-0:1.69.0-5.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:libnghttp2-devel-0:1.69.0-5.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:mingw32-libnghttp2-0:1.69.0-5.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:mingw32-libnghttp2-0:1.69.0-5.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:mingw64-libnghttp2-0:1.69.0-5.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:mingw64-libnghttp2-0:1.69.0-5.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:52414	self
https://access.redhat.com/security/cve/CVE-2026-58055	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-58055	self
https://bugzilla.redhat.com/show_bug.cgi?id=2493954	external
https://www.cve.org/CVERecord?id=CVE-2026-58055	external
https://nvd.nist.gov/vuln/detail/CVE-2026-58055	external
https://github.com/bikini/exploitarium/tree/main/…	external
https://github.com/nghttp2/nghttp2/commit/ab28105…	external
https://www.vulncheck.com/advisories/nghttp2-nght…	external

JSON

To clipboard

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          "text": "A flaw in nghttp2\u0027s 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.",
          "title": "Vulnerability description"
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          "text": "nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw in nghttp2\u0027s nghttpx proxy allows remote HTTP request smuggling and cross-client response poisoning by forwarding malformed HTTP/1.1 Upgrade requests containing a Content-Length body. This is rated Moderate because successful exploitation requires high attack complexity on the backend server.",
          "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.",
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-58055"
        },
        {
          "category": "external",
          "summary": "RHBZ#2493954",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2493954"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-58055",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-58055"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-58055",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58055"
        },
        {
          "category": "external",
          "summary": "https://github.com/bikini/exploitarium/tree/main/nghttp2-nghttpx-upgrade-queue-poison-poc",
          "url": "https://github.com/bikini/exploitarium/tree/main/nghttp2-nghttpx-upgrade-queue-poison-poc"
        },
        {
          "category": "external",
          "summary": "https://github.com/nghttp2/nghttp2/commit/ab28105c4a0197da24f8bfc414bc116055249e1e",
          "url": "https://github.com/nghttp2/nghttp2/commit/ab28105c4a0197da24f8bfc414bc116055249e1e"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/nghttp2-nghttpx-http-request-response-smuggling-via-upgrade-request-with-content-length",
          "url": "https://www.vulncheck.com/advisories/nghttp2-nghttpx-http-request-response-smuggling-via-upgrade-request-with-content-length"
        }
      ],
      "release_date": "2026-06-28T01:32:57.163000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-10T01:09:10+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:libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:libnghttp2-devel-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:libnghttp2-devel-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:mingw32-libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:mingw32-libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:mingw64-libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:mingw64-libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@src",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:52414"
        },
        {
          "category": "workaround",
          "details": "Configure your WAF or load balancer to drop incoming HTTP/1.1 requests that contain both Upgrade and Content-Length headers. This blocks the malformed traffic at the edge before it can reach the vulnerable proxy without impacting legitimate users.",
          "product_ids": [
            "Red Hat Hardened Images:libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:libnghttp2-devel-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:libnghttp2-devel-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:mingw32-libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:mingw32-libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:mingw64-libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:mingw64-libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@src",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@x86_64"
          ]
        }
      ],
      "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"
          },
          "products": [
            "Red Hat Hardened Images:libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:libnghttp2-devel-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:libnghttp2-devel-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:mingw32-libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:mingw32-libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:mingw64-libnghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:mingw64-libnghttp2-0:1.69.0-5.hum1@x86_64",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@aarch64",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@src",
            "Red Hat Hardened Images:nghttp2-0:1.69.0-5.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests"
    }
  ]
}

CVE-2026-58055 (GCVE-0-2026-58055)

Vulnerability from cvelistv5 – Published: 2026-06-28 01:32 – Updated: 2026-06-29 13:51

Title

nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

Summary

nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:L/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-29 13:51 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

VulnCheck mitre root Scorecard

References

3 references

URL	Tags
https://github.com/bikini/exploitarium/tree/main/…	exploitthird-party-advisory
https://github.com/nghttp2/nghttp2/commit/ab28105…	patch
https://www.vulncheck.com/advisories/nghttp2-nght…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
nghttp2	nghttp2	Affected: 0 , ≤ 1.69.0 (semver) cpe:2.3:a:nghttp2:nghttp2::::::::

Date Public

2026-06-26 00:00

Credits

ashdfrkl

Show details on NVD website

JSON

To clipboard

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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.

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.

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.

Action not permitted

RHSA-2026:52414

CVE-2026-58055 (GCVE-0-2026-58055)

Tags

Sightings

Nomenclature

Related by attack behaviour