Skip to content
VulniPulse
Sign in
Advisory severityMedium6.9Red Hat Linux

Medium [CVE-2026-56132] Arbitrary Code Execution via Heap-based Buffer Overflow

This medium-severity Red Hat Linux advisory covers CVE-2026-56132 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-56132 Source published Source updated

VulniPulse record published

CVE-2026-56132
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Android app · Google Play

Monitor future Red Hat Linux CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery
Get CVE alertsSee app features

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. 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. Red Hat severity: Moderate — CVSS 6.9 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L).

Weakness: CWE-131. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat Update Infrastructure 5; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat OpenShift Container Platform 4.

Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:64810, RHSA-2026:64809, RHSA-2026:64812, RHSA-2026:30647, RHSA-2026:67956.

Affected versions
  • < 2.8.2

Official advisory · high-confidence parse· fetched 2 days ago·verify at source

Fixed versions
  • expat-0:2.7.3-1.el10_2.3
  • expat-0:2.5.0-2.el8_10.2
  • expat-0:2.5.0-6.el9_8.3
  • expat-main-2.8.2-1.hum1
  • rhui5/cds-kubernetes-rhel9:1789479916
  • rhui5/cds-rhel9:1789479900
  • rhui5/haproxy-rhel9:1789479891
  • rhui5/installer-rhel9:1789482961
  • rhui5/rhua-rhel9:1789478095
  • RHSA-2026:64810
  • RHSA-2026:64809
  • RHSA-2026:64812
  • RHSA-2026:30647
  • RHSA-2026:67956

Official advisory · high-confidence parse· fetched 2 days ago·verify at source

Mitigation

Upgrade to a fixed release: expat-0:2.7.3-1.el10_2.3, expat-0:2.5.0-2.el8_10.2, expat-0:2.5.0-6.el9_8.3, expat-main-2.8.2-1.hum1, rhui5/cds-kubernetes-rhel9:1789479916, rhui5/cds-rhel9:1789479900. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 days ago·verify at source

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.

Sign in to join the discussion.