Vulnerability-Lookup

RHSA-2026:85985

Vulnerability from csaf_redhat - Published: 2026-10-20 13:23 - Updated: 2026-10-31 06:20

Summary

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

Severity

Important

Notes

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

Details: This update includes the following RPMs: expat: * expat-2.9.0-1.hum1 (aarch64, s390x, x86_64) * expat-devel-2.9.0-1.hum1 (aarch64, s390x, x86_64) * expat-static-2.9.0-1.hum1 (aarch64, s390x, x86_64) * expat-2.9.0-1.hum1.src (src) Security Fix(es): expat: * CVE-2026-77214

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-2026-77214

A flaw was found in expat. A remote attacker can exploit this vulnerability through repeated parse buffer operations with unvalidated buffer lengths, causing a heap buffer over-read. This issue primarily leads to information disclosure by leaking adjacent heap memory contents, which could assist in bypassing security mitigations such as Address Space Layout Randomization (ASLR), or result in a Denial of Service (DoS) by crashing the application.

8.2 (High)


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

CWE-125 - Out-of-bounds Read

Affected products

Fixed 10 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:expat-0:2.9.0-1.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-0:2.9.0-1.hum1@s390x	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-0:2.9.0-1.hum1@src	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-0:2.9.0-1.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@s390x	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@s390x	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@x86_64	—	Vendor Fix fix

Threats

Impact Important

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:85985	self
https://access.redhat.com/security/cve/CVE-2026-77214	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-2026-77214	self
https://bugzilla.redhat.com/show_bug.cgi?id=2547476	external
https://www.cve.org/CVERecord?id=CVE-2026-77214	external
https://nvd.nist.gov/vuln/detail/CVE-2026-77214	external
https://github.com/libexpat/libexpat/commit/13c5f…	external
https://github.com/libexpat/libexpat/pull/1393	external
https://www.vulncheck.com/advisories/libexpat-hea…	external

JSON

To clipboard

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  "vulnerabilities": [
    {
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      "cwe": {
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        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2026-10-07T14:42:40.407146+00:00",
      "ids": [
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          "text": "2547476"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in expat. A remote attacker can exploit this vulnerability through repeated parse buffer operations with unvalidated buffer lengths, causing a heap buffer over-read. This issue primarily leads to information disclosure by leaking adjacent heap memory contents, which could assist in bypassing security mitigations such as Address Space Layout Randomization (ASLR), or result in a Denial of Service (DoS) by crashing the application.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "expat: expat: Information disclosure via heap buffer over-read in XML_ParseBuffer",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as an Important severity because the Expat XML parser is ubiquitous across Red Hat Enterprise Linux environments, frequently handling untrusted inputs in network-facing services and runtime environments. When applications process incoming XML data through repeated chunked parsing calls, an unauthenticated attacker can induce an out-of-bounds heap read without requiring prior privileges. This memory disclosure enables the retrieval of process memory layouts and pointers, effectively weakening ASLR and lowering the barrier for subsequent exploit chains.",
          "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"
        }
      ],
      "product_status": {
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          "Red Hat Hardened Images:expat-0:2.9.0-1.hum1@s390x",
          "Red Hat Hardened Images:expat-0:2.9.0-1.hum1@src",
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          "Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@s390x",
          "Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@x86_64"
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      },
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          "url": "https://access.redhat.com/security/cve/CVE-2026-77214"
        },
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547476"
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        {
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-77214",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-77214"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-77214",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77214"
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          "url": "https://github.com/libexpat/libexpat/pull/1393"
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          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/libexpat-heap-buffer-over-read-in-xmlparse-c-via-xml-parsebuffer",
          "url": "https://www.vulncheck.com/advisories/libexpat-heap-buffer-over-read-in-xmlparse-c-via-xml-parsebuffer"
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      ],
      "release_date": "2026-10-07T14:35:42.794000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-20T13:23:57+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:expat-0:2.9.0-1.hum1@aarch64",
            "Red Hat Hardened Images:expat-0:2.9.0-1.hum1@s390x",
            "Red Hat Hardened Images:expat-0:2.9.0-1.hum1@src",
            "Red Hat Hardened Images:expat-0:2.9.0-1.hum1@x86_64",
            "Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@aarch64",
            "Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@s390x",
            "Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@x86_64",
            "Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@aarch64",
            "Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@s390x",
            "Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:85985"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:expat-0:2.9.0-1.hum1@s390x",
            "Red Hat Hardened Images:expat-0:2.9.0-1.hum1@src",
            "Red Hat Hardened Images:expat-0:2.9.0-1.hum1@x86_64",
            "Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@aarch64",
            "Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@s390x",
            "Red Hat Hardened Images:expat-devel-0:2.9.0-1.hum1@x86_64",
            "Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@aarch64",
            "Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@s390x",
            "Red Hat Hardened Images:expat-static-0:2.9.0-1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "expat: expat: Information disclosure via heap buffer over-read in XML_ParseBuffer"
    }
  ]
}

CVE-2026-77214 (GCVE-0-2026-77214)

Vulnerability from cvelistv5 – Published: 2026-10-07 14:35 – Updated: 2026-10-27 10:14 X_Open Source

Title

libexpat Heap Buffer Over-read in xmlparse.c via XML_ParseBuffer

Summary

libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching this path requires a parse buffer to already be present; otherwise XML_ParseBuffer returns XML_ERROR_NO_BUFFER. A buffer is present after a prior call to XML_GetBuffer, either directly (the common case) or indirectly through a prior XML_Parse call that allocates the buffer internally. The over-read discloses adjacent heap memory to the calling application, recovering heap pointers, libc function pointers, and code pointers sufficient to defeat ASLR and build further exploitation primitives.

Severity

8.3 (High)


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

8.2 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-10 02:25 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7140 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/libexpat/libexpat/pull/1393	issue-tracking
https://github.com/libexpat/libexpat/commit/13c5f…	patch
https://www.vulncheck.com/advisories/libexpat-hea…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
libexpat	libexpat	Affected: 0 , ≤ 2.8.5 (semver) Unaffected: 13c5f63a7f1c52c2feee3b16a1134d4fb68e9ea0 (git) cpe:2.3:a:libexpat_project:libexpat::::::::

Date Public

2026-09-24 00:00

Credits

Fabian Wahle (Hap Security) Filippo Tedeschi VulnCheck

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.

Vulnerability timeline

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