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Fencer Intel
high 7.5

CVE-2026-54059 json

Pillow: PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protection bypass via PCF font loading

published 4mo ago modified 17d ago also BIT-pillow-2026-54059 , EUVD-2026-41899 , GHSA-8v84-f9pq-wr9x , PYSEC-2026-2253

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

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.

Patch / fix

  • pypi pillow 12.3.0
  • bitnami pillow 12.3.0
  • python pillow 12.3.0
  • pillow Debian 14 12.3.0-1

debian advisories DEBIAN-CVE-2026-54059

  • pillow Ubuntu 22.04 LTS 9.0.1-1ubuntu0.6
  • pillow Ubuntu 24.04 LTS 10.2.0-1ubuntu1.4
  • pillow Ubuntu 26.04 LTS 12.1.1-2ubuntu1.4

ubuntu advisories UBUNTU-CVE-2026-54059

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • receptor ansible automation platform inside 2.5, ansible automation platform developer 2.5, ansible automation platform 2.5 1.6.7-1.el8ap
  • receptor ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 1.6.7-1.el9ap
  • receptorctl ansible automation platform inside 2.5, ansible automation platform developer 2.5, ansible automation platform 2.5 1.6.7-1.el8ap
  • receptorctl ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 1.6.7-1.el9ap
  • python3.12-daphne ansible automation platform 2.5 4.2.2-1.el8ap
  • python3.12-daphne ansible automation platform 2.6, ansible automation platform 2.5 4.2.2-1.el9ap
  • python3.12-pillow ansible automation platform 2.5 12.3.0-1.el8ap
  • python3.12-pillow ansible automation platform 2.6, ansible automation platform 2.5 12.3.0-1.el9ap

red hat advisories RHSA-2026:52551RHSA-2026:50319RHSA-2026:50336RHSA-2026:50263RHSA-2026:50222RHSA-2026:50223

  • python-Pillow SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 9.5.0-150400.5.25.1
  • python-Pillow SLE Module for Package Hub 15 SP7 7.2.0-150300.3.27.1
  • python-Pillow SLES for SAP applications 16.0, SLES 16.0 11.3.0-160000.6.1

suse advisories SUSE-SU-2026:3268-1SUSE-SU-2026:2875-1SUSE-SU-2026:22626-1

  • python-Pillow openSUSE Tumbleweed 12.3.0-1.1
  • python-Pillow openSUSE Leap 16.0 11.3.0-160000.6.1

opensuse advisories openSUSE-SU-2026:11261-1openSUSE-SU-2026:21296-1

  • python3-pillow AlmaLinux 8 5.1.1-22.el8_10
  • python3-pillow-tk AlmaLinux 8 5.1.1-22.el8_10

almalinux advisories ALSA-2026:39127

  • python-pillow Rocky Linux 8 5.1.1-22.el8_10

rocky linux advisories RLSA-2026:39127

Is CVE-2026-54059 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-54059 updated cvss 7.5

python-pillow: Pillow: Denial of Service via crafted PCF font data

  • Red Hat Satellite 6 python-pillow
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2.5 for RHEL 8 python3.12-pillow 12.3.0-1.el8ap Red Hat Ansible Automation Platform 2.5 for RHEL 9 python3.12-pillow 12.3.0-1.el9ap
    fixed: vendor fix RHSA-2026:50319
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 python3.12-pillow 12.3.0-1.el9ap
    fixed: vendor fix RHSA-2026:50336
  • Red Hat Enterprise Linux AppStream (v. 8) python-pillow 5.1.1-22.el8_10, python3-pillow 5.1.1-22.el8_10
    fixed: vendor fix RHSA-2026:39127
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) python-pillow 5.1.1-15.el8_4.2, python3-pillow 5.1.1-15.el8_4.2
    fixed: vendor fix RHSA-2026:52551
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) python-pillow 5.1.1-20.el8_6, python3-pillow 5.1.1-20.el8_6
    fixed: vendor fix RHSA-2026:48760
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) python-pillow 5.1.1-20.el8_8, python3-pillow 5.1.1-20.el8_8
    fixed: vendor fix RHSA-2026:48759
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) python-pillow 5.1.1-15.el8_4.2, python3-pillow 5.1.1-15.el8_4.2
    fixed: vendor fix RHSA-2026:52551
show 8 more
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) python-pillow 5.1.1-20.el8_6, python3-pillow 5.1.1-20.el8_6
    fixed: vendor fix RHSA-2026:48760
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) python-pillow 5.1.1-20.el8_8, python3-pillow 5.1.1-20.el8_8
    fixed: vendor fix RHSA-2026:48759
  • Red Hat Enterprise Linux CRB (v. 8) python3-pillow 5.1.1-22.el8_10, python3-pillow-tk 5.1.1-22.el8_10
    fixed: vendor fix RHSA-2026:39127
  • Red Hat Satellite 6.16 for RHEL 8 python-pillow 12.3.0-1.el8pc, python3.11-pillow 12.3.0-1.el8pc Red Hat Satellite 6.16 for RHEL 9 python-pillow 12.3.0-1.el9pc, python3.11-pillow 12.3.0-1.el9pc
    fixed: vendor fix RHSA-2026:50223
  • Red Hat Satellite 6.17 for RHEL 9 python-pillow 12.3.0-1.el9pc, python3.11-pillow 12.3.0-1.el9pc
    fixed: vendor fix RHSA-2026:50222
  • Red Hat Satellite 6.18 for RHEL 9 python3.12-pillow 12.3.0-1.el9pc
    fixed: vendor fix RHSA-2026:50263
  • Red Hat Satellite 6.19 for RHEL 9 python3.12-pillow 12.3.0-1.el9pc
    fixed: vendor fix RHSA-2026:50221
  • Red Hat Ansible Automation Platform 2 python-pillow Red Hat Ansible Automation Platform 2.5 for RHEL 8 receptor 1.6.7-1.el8ap, receptorctl 1.6.7-1.el8ap, automation-hub 4.10.17-1.el8ap, python3.12-daphne 4.2.2-1.el8ap, python3.12-pyasn1 0.6.4-1.el8ap, python3.12-aiohttp 3.14.1-2.el8ap, +17 more Red Hat Ansible Automation Platform 2.5 for RHEL 9 receptor 1.6.7-1.el9ap, receptorctl 1.6.7-1.el9ap, automation-hub 4.10.17-1.el9ap, python3.12-daphne 4.2.2-1.el9ap, python3.12-pyasn1 0.6.4-1.el9ap, python3.12-aiohttp 3.14.1-2.el9ap, +17 more Red Hat Ansible Automation Platform 2.6 for RHEL 9 receptor 1.6.7-1.el9ap, receptorctl 1.6.7-1.el9ap, automation-hub 4.11.12-1.el9ap, python3.12-daphne 4.2.2-1.el9ap, python3.12-pyasn1 0.6.4-1.el9ap, ansible-dev-tools 26.7.2-1.el9ap, +34 more Red Hat Ansible Automation Platform 2.6 for RHEL 10 receptor 1.6.7-1.el10ap, receptorctl 1.6.7-1.el10ap, ansible-dev-tools 26.7.2-1.el10ap, python-tox-ansible 26.7.1-1.el10ap, python3-tox-ansible 26.7.1-1.el10ap, ansible-dev-tools+server 26.7.2-1.el10ap Red Hat Enterprise Linux 7 python-pillow, python-pillow-qt, python-pillow-tk, python-pillow-sane
    +6 more products
    Red Hat Satellite 6 python-pillow Red Hat Satellite 6.16 for RHEL 8 libsolv 0.7.20-7.el8sat, satellite 6.16.12-1.el8sat, python-pyjwt 2.13.0-1.el8pc, python3-solv 0.7.20-7.el8sat, openvox-agent 8.24.1-3.el8sat, openvox-server 8.14.1-1.el8sat, +16 more Red Hat Satellite 6.16 for RHEL 9 satellite 6.16.12-1.el9sat, python-pyjwt 2.13.0-1.el9pc, openvox-agent 8.24.1-3.el9sat, openvox-server 8.14.1-1.el9sat, satellite-cli 6.16.12-1.el9sat, python-pysequoia 0.1.33-1.el9pc, +14 more Red Hat Satellite 6.17 for RHEL 9 satellite 6.17.10-1.el9sat, python-pyjwt 2.13.0-1.el9pc, openvox-agent 8.24.1-3.el9sat, openvox-server 8.14.1-1.el9sat, satellite-cli 6.17.10-1.el9sat, python-pysequoia 0.1.33-1.el9pc, +16 more Red Hat Satellite 6.18 for RHEL 9 satellite 6.18.8-1.el9sat, openvox-agent 8.24.1-3.el9sat, satellite-cli 6.18.8-1.el9sat, openvox-server 8.14.1-1.el9sat, python3.12-pyjwt 2.13.0-1.el9pc, rubygem-faraday 1.10.6-1.el9sat, +14 more Red Hat Satellite 6.19 for RHEL 9 foreman 3.18.0.8-1.el9sat, satellite 6.19.3-1.el9sat, foreman-cli 3.18.0.8-1.el9sat, foreman-ec2 3.18.0.8-1.el9sat, foreman-pcp 3.18.0.8-1.el9sat, satellite-cli 6.19.3-1.el9sat, +22 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
4mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi pillow
<12.3.0
12.3.0
bitnami pillow
<12.3.0
12.3.0

Affected products

  • python-pillow Pillow

Classification

Weakness
  • CWE-789 Memory Allocation with Excessive Size Value

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of python-pillow/Pillow published their own advisory on GitHub. Reviewed sources take precedence over it.