Vulnerability-Lookup

RHSA-2026:88248

Vulnerability from csaf_opensuse - Published: 2026-10-22 14:36 - Updated: 2026-11-02 10:51

Summary

Red Hat Security Advisory: expat security update

Severity

Important

Notes

Topic: An update for expat is now available for Red Hat Enterprise Linux 10.2 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. 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: Expat is a C library for parsing XML documents. Security Fix(es): * expat: expat: Denial of Service via integer overflow in expat_realloc (CVE-2026-102633) * expat: expat: Information disclosure via heap buffer over-read in XML_ParseBuffer (CVE-2026-77214) 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.

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 25 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.7.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.7.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.7.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.7.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.7.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.7.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.7.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.7.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-devel-0:2.7.3-1.el10_2.7.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-devel-0:2.7.3-1.el10_2.7.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-devel-0:2.7.3-1.el10_2.7.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:expat-devel-0:2.7.3-1.el10_2.7.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.7.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.7.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.7.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.7.src	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-0:2.7.3-1.el10_2.7.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.7.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.7.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.7.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-debuginfo-0:2.7.3-1.el10_2.7.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.7.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.7.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.7.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-10.2.Z:expat-debugsource-0:2.7.3-1.el10_2.7.x86_64	—	Vendor Fix fix

Threats

Impact Important

CVE-2026-102633

A flaw was found in expat. On 32-bit systems, an integer overflow occurs within the expat_realloc memory allocation function when calculating buffer sizes. A remote attacker can exploit this vulnerability by supplying specially crafted XML input to an application that processes data with the library. Successful exploitation can lead to a Denial of Service (DoS) or memory corruption.

5.9 (Medium)


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

CWE-190 - Integer Overflow or Wraparound

Affected products

Fixed 25 products, the same list as for CVE-2026-77214

Threats

Impact Moderate

References

21 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:88248	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2543288	external
https://bugzilla.redhat.com/show_bug.cgi?id=2547476	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
https://access.redhat.com/security/cve/CVE-2026-102633	self
https://bugzilla.redhat.com/show_bug.cgi?id=2543288	external
https://www.cve.org/CVERecord?id=CVE-2026-102633	external
https://nvd.nist.gov/vuln/detail/CVE-2026-102633	external
https://github.com/libexpat/libexpat	external
https://github.com/libexpat/libexpat/blob/R_2_8_5…	external
https://github.com/libexpat/libexpat/commit/20980…	external
https://github.com/libexpat/libexpat/pull/1392	external
https://www.vulncheck.com/advisories/libexpat-2.7…	external

JSON

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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "expat: expat: Information disclosure via heap buffer over-read in XML_ParseBuffer"
    },
    {
      "cve": "CVE-2026-102633",
      "cwe": {
        "id": "CWE-190",
        "name": "Integer Overflow or Wraparound"
      },
      "discovery_date": "2026-09-29T16:31:19.583045+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2543288"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in expat. On 32-bit systems, an integer overflow occurs within the expat_realloc memory allocation function when calculating buffer sizes. A remote attacker can exploit this vulnerability by supplying specially crafted XML input to an application that processes data with the library. Successful exploitation can lead to a Denial of Service (DoS) or memory corruption.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "expat: expat: Denial of Service via integer overflow in expat_realloc",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw of moderate impact was found in the expat XML parser library (libexpat), which is shipped in Red Hat Enterprise Linux and Fedora. On 32-bit systems, an integer overflow can occur in the expat_realloc() memory allocation function when buffer sizes are calculated, resulting in an undersized heap allocation that can lead to a heap buffer overflow, memory corruption, or a crash. A remote attacker can supply specially crafted XML input to an application that processes data with the vulnerable library, causing a denial of service of that application; no privileges or user interaction are required, but exploitation is limited to 32-bit platforms and requires triggering specific allocation sizes, so attack complexity is high.\n\nRed Hat Product Security rates this flaw Moderate (CVSS 3.1 score 5.9, AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H), which differs from the upstream CVSS 4.0 rating of Important (8.2) because the vulnerability is restricted to 32-bit architectures with high attack complexity and its impact is limited to availability.\n\nAffected expat and mingw-expat components span Red Hat Enterprise Linux 6 through 10, Red Hat In-Vehicle OS, Red Hat Hardened Images, and Fedora. For Red Hat Enterprise Linux and UBI-related streams, fixes are being pursued through delegated updates. For several maintenance streams the fix is deferred because the flaw is Moderate severity with a CVSS score below 7.0, leaving a residual risk of denial of service or memory corruption on 32-bit deployments until a fix is delivered. Red Hat Enterprise Linux 6 and certain platform streams are out of support scope and will not be fixed. The expat package in Red Hat Hardened Images (Hummingbird) is not affected because the vulnerable code is not present.",
          "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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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-102633"
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        {
          "category": "external",
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        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-102633",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-102633"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-102633",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102633"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat",
          "url": "https://github.com/libexpat/libexpat"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/blob/R_2_8_5/expat/lib/xmlparse.c#L1003",
          "url": "https://github.com/libexpat/libexpat/blob/R_2_8_5/expat/lib/xmlparse.c#L1003"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/commit/209801d7fbaf07ab74bae8cb32dd2ab9e5846118",
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          "category": "external",
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          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.8.5-integer-overflow-in-expat-realloc",
          "url": "https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.8.5-integer-overflow-in-expat-realloc"
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      "release_date": "2026-09-29T16:04:16.738000+00:00",
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          "date": "2026-10-22T14:36:24+00:00",
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            "confidentialityImpact": "NONE",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "expat: expat: Denial of Service via integer overflow in expat_realloc"
    }
  ]
}

CVE-2026-102633 (GCVE-0-2026-102633)

Vulnerability from cvelistv5 – Published: 2026-09-29 16:04 – Updated: 2026-09-29 16:52

Title

libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc

Summary

libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.

Severity

8.2 (High)


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

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-29 16:52 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

VulnCheck CNA under the mitre root

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

References

5 references

URL	Tags
https://github.com/libexpat/libexpat/pull/1392	issue-trackingpatch
https://github.com/libexpat/libexpat/commit/20980…	patch
https://github.com/libexpat/libexpat/blob/R_2_8_5…	technical-description
https://github.com/libexpat/libexpat	product
https://www.vulncheck.com/advisories/libexpat-2.7…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
libexpat	libexpat	Affected: 2.7.2 , ≤ 2.8.5 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Date Public

2026-09-25 00:00

Credits

Filippo Tedeschi Matthew Fernandez Filippo Tedeschi

Show details on NVD website

JSON

To clipboard

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      ],
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          "lang": "en",
          "value": "libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service."
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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.

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RHSA-2026:88248

CVE-2026-102633 (GCVE-0-2026-102633)

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

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