Bug 2497464 (CVE-2026-54059)

Summary: CVE-2026-54059 python-pillow: Pillow: Denial of Service via crafted PCF font data
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anthomas, dschmidt, ehelms, ggainey, jlanda, jpasqual, juwatts, kshier, mdellweg, mhulan, nmoumoul, osousa, pcreech, rchan, rhel-process-autobot, simaishi, smallamp, stcannon, teagle, tmalecek, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in Pillow, a Python imaging library. 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.
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Clone Of: Environment:
Last Closed: Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2497683, 2497682    
Bug Blocks:    

Description OSIDB Bzimport 2026-07-06 20:02:44 UTC
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.

Comment 4 errata-xmlrpc 2026-07-14 08:41:50 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:39127 https://access.redhat.com/errata/RHSA-2026:39127

Comment 6 errata-xmlrpc 2026-07-30 11:41:51 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:48760 https://access.redhat.com/errata/RHSA-2026:48760

Comment 7 errata-xmlrpc 2026-07-30 11:46:34 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:48759 https://access.redhat.com/errata/RHSA-2026:48759

Comment 8 errata-xmlrpc 2026-08-04 15:56:28 UTC
This issue has been addressed in the following products:

  Red Hat Satellite 6.17 for RHEL 9

Via RHSA-2026:50222 https://access.redhat.com/errata/RHSA-2026:50222

Comment 9 errata-xmlrpc 2026-08-04 15:59:29 UTC
This issue has been addressed in the following products:

  Red Hat Satellite 6.16 for RHEL 8
  Red Hat Satellite 6.16 for RHEL 9

Via RHSA-2026:50223 https://access.redhat.com/errata/RHSA-2026:50223

Comment 10 errata-xmlrpc 2026-08-04 16:07:56 UTC
This issue has been addressed in the following products:

  Red Hat Satellite 6.18 for RHEL 9

Via RHSA-2026:50263 https://access.redhat.com/errata/RHSA-2026:50263

Comment 11 errata-xmlrpc 2026-08-04 17:58:09 UTC
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.5 for RHEL 9
  Red Hat Ansible Automation Platform 2.5 for RHEL 8

Via RHSA-2026:50319 https://access.redhat.com/errata/RHSA-2026:50319

Comment 12 errata-xmlrpc 2026-08-04 18:44:40 UTC
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.6 for RHEL 9
  Red Hat Ansible Automation Platform 2.6 for RHEL 10

Via RHSA-2026:50336 https://access.redhat.com/errata/RHSA-2026:50336

Comment 13 errata-xmlrpc 2026-08-10 03:58:02 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:52551 https://access.redhat.com/errata/RHSA-2026:52551