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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-54059] Denial of Service via crafted PCF font data

This high-severity Red Hat Linux advisory covers CVE-2026-54059 affecting Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 9.

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

CVE-2026-54059 Source published Source updated

VulniPulse record published Record updated

CVE-2026-54059
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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Summary

Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes() without calling Image._decompression_bomb_check(), allowing crafted PCF font data to cause excessive memory allocation.

This issue is fixed in version 12.3.0. A remote attacker could exploit this vulnerability by providing specially crafted PCF font data.

This data, when processed, can lead to excessive memory allocation because the library does not properly check for decompression bombs. The primary consequence is a Denial of Service (DoS), which could make the affected system or application unavailable.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-409.

Affected products named by the advisory: Red Hat Ansible Automation Platform 2.5 for RHEL 8; Red Hat Ansible Automation Platform 2.5 for RHEL 9; Red Hat Ansible Automation Platform 2.6 for RHEL 9; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 11 more.

Affected versions
  • < 12.3.0

Official advisory · high-confidence parse· fetched 12 days ago·verify at source

Fixed versions
  • 12.3.0
  • python3.12-pillow-0:12.3.0-1.el8ap
  • python3.12-pillow-0:12.3.0-1.el9ap
  • python-pillow-0:5.1.1-22.el8_10
  • python-pillow-0:5.1.1-15.el8_4.2
  • python-pillow-0:5.1.1-20.el8_6
  • python-pillow-0:5.1.1-20.el8_8
  • python-pillow-0:12.3.0-1.el8pc
  • python-pillow-0:12.3.0-1.el9pc
  • python3.12-pillow-0:12.3.0-1.el9pc
  • RHSA-2026:50319
  • RHSA-2026:50336
  • RHSA-2026:39127
  • RHSA-2026:52551
  • RHSA-2026:48760
  • RHSA-2026:48759
  • RHSA-2026:50223
  • RHSA-2026:50222
  • RHSA-2026:50263
  • RHSA-2026:50221

Official advisory · high-confidence parse· fetched 12 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Do not load PCF fonts from untrusted sources. If PCF font loading is required, validate font file dimensions before passing them to Pillow, or upgrade to Pillow 12.3.0 or later which includes the fix for this vulnerability.

Official advisory · high-confidence parse· fetched 12 days ago·verify at source

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