Vulnerability-Lookup

RHSA-2026:64809

Vulnerability from csaf_redhat - Published: 2026-09-08 05:19 - Updated: 2026-09-08 08:18

Summary

Red Hat Security Advisory: expat security update

Severity

Moderate

Notes

Topic: An update for expat is now available for Red Hat Enterprise Linux 8. 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: Expat is a C library for parsing XML documents. Security Fix(es): * expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking (CVE-2026-50219) * expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132) 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-2026-50219

A flaw was found in libexpat. This vulnerability occurs because the library, in versions before 2.8.2, does not properly track handler call depth when certain XML parsing functions are invoked from within handlers during a policy violation. This oversight can lead to a use-after-free condition, which may result in information disclosure, integrity loss, or denial of service.

4.9 (Medium)


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

CWE-911 - Improper Update of Reference Count

Affected products

Fixed 21 products

Product	Version	Remediation
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.i686	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

CVE-2026-56132

A flaw was found in libexpat, a library used for parsing XML data. An attacker could exploit a heap-based buffer overflow, a type of memory error, by providing specially crafted XML input. This vulnerability occurs when the library mishandles memory reallocation while processing XML, particularly when multiple parsers share data. Successful exploitation could allow the attacker to execute arbitrary code, access sensitive information, or cause the application to crash, leading to a denial of service.

6.9 (Medium)


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

CWE-131 - Incorrect Calculation of Buffer Size

Affected products

Fixed 21 products

Product	Version	Remediation
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.i686	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.src	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-0:2.5.0-2.el8_10.2.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.i686	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debuginfo-0:2.5.0-2.el8_10.2.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.i686	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-debugsource-0:2.5.0-2.el8_10.2.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.i686	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:expat-devel-0:2.5.0-2.el8_10.2.x86_64	—	Vendor Fix fix

Threats

Impact Moderate

References

15 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:64809	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2484620	external
https://bugzilla.redhat.com/show_bug.cgi?id=2490669	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-50219	self
https://bugzilla.redhat.com/show_bug.cgi?id=2484620	external
https://www.cve.org/CVERecord?id=CVE-2026-50219	external
https://nvd.nist.gov/vuln/detail/CVE-2026-50219	external
https://github.com/libexpat/libexpat/pull/1246	external
https://access.redhat.com/security/cve/CVE-2026-56132	self
https://bugzilla.redhat.com/show_bug.cgi?id=2490669	external
https://www.cve.org/CVERecord?id=CVE-2026-56132	external
https://nvd.nist.gov/vuln/detail/CVE-2026-56132	external
https://github.com/libexpat/libexpat/pull/1272	external

JSON

To clipboard

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CVE-2026-50219 (GCVE-0-2026-50219)

Vulnerability from cvelistv5 – Published: 2026-06-04 04:20 – Updated: 2026-06-04 12:36

Summary

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

Severity

4.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-04 12:36 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1246

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56132 (GCVE-0-2026-56132)

Vulnerability from cvelistv5 – Published: 2026-06-19 03:00 – Updated: 2026-06-22 14:59

Summary

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

Severity

6.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 14:59 UTC

CWE

CWE-821 - Incorrect Synchronization

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1272

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

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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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

RHSA-2026:64809

CVE-2026-50219 (GCVE-0-2026-50219)

CVE-2026-56132 (GCVE-0-2026-56132)

Tags

Sightings

Nomenclature