Skip to content
Fencer Intel
high 7.5

CVE-2026-55379 json

Pillow BdfFontFile`: `Image.new()` called without `_decompression_bomb_check()` — bomb protection bypass via font loading

published 4mo ago modified 17d ago also BIT-pillow-2026-55379 , EUVD-2026-41902 , GHSA-45hq-cxwh-f6vc , PYSEC-2026-2255

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing 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-2026-55379

  • 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-2026-55379

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-2026-55379 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.

Check with Fencer

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-2026-55379 updated cvss 7.5

python-pillow: Pillow: Denial of Service via crafted BDF font file

  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat Lightspeed Core lightspeed-core/lightspeed-stack-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-service-api-rhel9
    affected: workaround, no fix available
  • Red Hat AI Inference Server rhaii/vllm-tpu-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, rhaii/vllm-gaudi-rhel9, rhaii/vllm-neuron-rhel9, rhaiis/vllm-spyre-rhel9, +1 more Red Hat Ansible Automation Platform 2 ansible-automation-platform/automation-dashboard-rhel9, ansible-automation-platform-25/lightspeed-chatbot-rhel8
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-gaudi-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-vllm-gaudi-rhel9, rhoai/odh-caikit-tgis-serving-rhel9, rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 Red Hat Satellite 6 python-pillow 12.2.0-1.el8pc
    affected: workaround, no fix available
  • Red Hat AI Inference Server 3.2 rhaiis/vllm-cuda-rhel9 1787860580, rhaiis/vllm-rocm-rhel9 1787884873, rhaiis/model-opt-cuda-rhel9 1787772157
    fixed: vendor fix RHSA-2026:61628
  • Red Hat AI Inference Server 3.3 rhaiis/model-opt-cuda-rhel9 1787601159
    fixed: vendor fix RHSA-2026:59518
  • Red Hat AI Inference Server 3.4 rhaii/vllm-cpu-rhel9 1789681128, rhaii/vllm-cpu-rhel9 1790075793, rhaii/vllm-cuda-rhel9 1789681126, rhaii/vllm-cuda-rhel9 1790090131, rhaii/vllm-rocm-rhel9 1789681126, rhaii/vllm-rocm-rhel9 1790109620, +4 more
    fixed: vendor fix RHSA-2026:70996
  • Red Hat Ansible Automation Platform 2.5 ansible-automation-platform-25/hub-rhel8 1785376274
    fixed: vendor fix RHSA-2026:50357
show 26 more
  • 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 ansible-automation-platform-26/hub-rhel9 1785753568, ansible-automation-platform-26/lightspeed-chatbot-rhel9 1785646188
    fixed: vendor fix RHSA-2026:50479
  • 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 Ansible Automation Platform 2.7 ansible-automation-platform-27/hub-rhel9 1785376164, ansible-automation-platform-27/lightspeed-chatbot-rhel9 1785426734
    fixed: vendor fix RHSA-2026:50340
  • Red Hat Enterprise Linux AI 3.3 rhelai3/bootc-cuda-rhel9 1788260684, rhelai3/bootc-aws-cuda-rhel9 1788273908, rhelai3/bootc-gcp-cuda-rhel9 1788273977, rhelai3/disk-image-cuda-rhel9 1788290314, rhelai3/bootc-azure-cuda-rhel9 1788273909
    fixed: vendor fix RHSA-2026:62336
  • Red Hat Enterprise Linux AI 3.4 rhelai3/bootc-cuda-rhel9 1790868254, rhelai3/bootc-rocm-rhel9 1790614447, rhelai3/bootc-aws-cuda-rhel9 1790881122, rhelai3/bootc-gcp-cuda-rhel9 1790881123, rhelai3/disk-image-cuda-rhel9 1790957417, rhelai3/bootc-azure-cuda-rhel9 1790881120, +1 more
    fixed: vendor fix RHSA-2026:76150
  • 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
  • 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 OpenShift AI 3.4 rhoai/odh-automl-rhel9 1786612415, rhoai/odh-autorag-rhel9 1786612637, rhoai/odh-llm-d-kv-cache-rhel9 1787169432, rhoai/odh-llama-stack-core-rhel9 1786635926, rhoai/odh-openvino-model-server-rhel9 1787303251, rhoai/odh-th06-cpu-torch210-py312-rhel9 1787076778, +18 more
    fixed: vendor fix RHSA-2026:60520
  • Red Hat Quay 3.9 quay/quay-rhel8 1785950004
    fixed: vendor fix RHSA-2026:50931
  • Red Hat Quay 3.10 quay/quay-rhel8 1786395065
    fixed: vendor fix RHSA-2026:53520
  • Red Hat Quay 3.12 quay/quay-rhel8 1786170635
    fixed: vendor fix RHSA-2026:52968
  • Red Hat Quay 3.14 quay/quay-rhel8 1788593843
    fixed: vendor fix RHSA-2026:70267
  • Red Hat Quay 3.15 quay/quay-rhel8 1785261506
    fixed: vendor fix RHSA-2026:48933
  • Red Hat Quay 3.16 quay/quay-rhel9 1789563753
    fixed: vendor fix RHSA-2026:69255
  • Red Hat Quay 3.17 quay/quay-rhel9 1786181981
    fixed: vendor fix RHSA-2026:54395
  • Red Hat Quay 3.18 quay/quay-rhel9 1791265590
    fixed: vendor fix RHSA-2026:81110
  • 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

1 more fixed, 27 more not affected in the full advisory

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

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc 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.