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Advisory severityHigh7.3Red Hat Linux

High [CVE-2026-56003] computeProps Property Buffer Heap Buffer Overflow

This high-severity Red Hat Linux advisory covers CVE-2026-56003 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.

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

CVE-2026-56003 Source published Source updated

VulniPulse record published Record updated

CVE-2026-56003
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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Summary

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server. Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).

Affected Red Hat products: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9.

Red Hat fixing advisory: RHSA-2026:51061, RHSA-2026:51063, RHSA-2026:47103, RHSA-2026:51060, RHSA-2026:51066, RHSA-2026:51067, RHSA-2026:51062, RHSA-2026:51058, RHSA-2026:51059.

Affected versions
  • < 2.0.8

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Fixed versions
  • libXfont2-0:2.0.6-5.el10_0.1
  • libXfont2-0:2.0.3-2.el7_9
  • libXfont2-0:2.0.3-2.el8_10.1
  • libXfont2-0:2.0.3-2.el8_4.1
  • libXfont2-0:2.0.3-2.el8_6.1
  • libXfont2-0:2.0.3-2.el8_8.1
  • libXfont2-0:2.0.3-12.el9_2.1
  • libXfont2-0:2.0.3-12.el9_4.1
  • libXfont2-0:2.0.3-12.el9_6.1
  • RHSA-2026:51061
  • RHSA-2026:51063
  • RHSA-2026:47103
  • RHSA-2026:51060
  • RHSA-2026:51066
  • RHSA-2026:51067
  • RHSA-2026:51062
  • RHSA-2026:51058
  • RHSA-2026:51059

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Mitigation

Upgrade to a fixed release: libXfont2-0:2.0.6-5.el10_0.1, libXfont2-0:2.0.3-2.el7_9, libXfont2-0:2.0.3-2.el8_10.1, libXfont2-0:2.0.3-2.el8_4.1, libXfont2-0:2.0.3-2.el8_6.1, libXfont2-0:2.0.3-2.el8_8.1. 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 13 days ago·verify at source

Discussion(0)

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