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Fencer Intel
medium 6.5

CVE-2026-59198 json

Pillow TGA RLE encoder can serialize up to ~57 KB of adjacent heap data into generated images

published 4mo ago modified 18d ago also BIT-pillow-2026-59198 , EUVD-2026-43752 , GHSA-fj7v-r99m-22gq , PYSEC-2026-3494

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

Pillow is a Python imaging library. From 5.2.0 until 12.3.0, Pillow's TGA RLE encoder reads past its packed row buffer when saving a mode 1 image with TGA RLE compression, allowing adjacent process heap bytes to be copied into the generated TGA file. 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-2026-59198

  • pillow Ubuntu 22.04 LTS 9.0.1-1ubuntu0.5
  • pillow Ubuntu 24.04 LTS 10.2.0-1ubuntu1.3
  • pillow Ubuntu 26.04 LTS 12.1.1-2ubuntu1.3
  • pillow Ubuntu Pro 20.04 LTS 7.0.0-4ubuntu0.9+esm1

ubuntu advisories UBUNTU-CVE-2026-59198

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

  • python-Pillow SLES 16.0, SLES for SAP applications 16.0 11.3.0-160000.8.1
  • 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 7.2.0-150300.3.30.1

suse advisories SUSE-SU-2026:23217-1SUSE-SU-2026:23228-1SUSE-SU-2026:3268-1SUSE-SU-2026:3084-1

  • python-Pillow openSUSE Leap 16.0 11.3.0-160000.8.1
  • python-Pillow openSUSE Tumbleweed 12.3.0-2.1

opensuse advisories openSUSE-SU-2026:21544-1openSUSE-SU-2026:11283-1

Is CVE-2026-59198 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-2026-59198 updated cvss 6.5

Pillow: Pillow: Information disclosure via TGA RLE encoder out-of-bounds read

  • Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/lightspeed-stack-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9, openshift-lightspeed/lightspeed-service-api-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 Red Hat AI Inference Server rhaii/vllm-cpu-rhel9, rhaii/vllm-tpu-rhel9, rhaii/vllm-cuda-rhel9, rhaii/vllm-rocm-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, +9 more Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/disk-image-cuda-rhel9, +2 more Red Hat OpenShift AI (RHOAI) rhoai/odh-automl-rhel9, rhoai/odh-mlflow-rhel9, rhoai/odh-autorag-rhel9, rhoai/odh-caikit-nlp-rhel9, rhoai/odh-vllm-gaudi-rhel9, rhoai/odh-kserve-agent-rhel9, +32 more Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat Ansible Automation Platform 2 python-pillow 10.3.0-1.el9ap, ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-27/hub-rhel9, ansible-automation-platform/automation-dashboard-rhel9, ansible-automation-platform-25/lightspeed-chatbot-rhel8, ansible-automation-platform-26/lightspeed-chatbot-rhel9, +1 more Red Hat Enterprise Linux 7 python-pillow, python-pillow-qt, python-pillow-tk, python-pillow-sane, python-pillow 10.3.0-1.el9ap Red Hat Enterprise Linux 8 python3-pillow, python3-pillow-tk, python-pillow 10.3.0-1.el9ap Red Hat Satellite 6 python-pillow 10.3.0-1.el9ap, python-pillow 12.2.0-1.el8pc
    under investigation

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
no
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/python-pillow/Pillow/security/advisories/GHSA-fj7v-r99m-22gq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L

Affected packages

ecosystem package affected fixed in
pypi pillow
>=5.2.0, <12.3.0
12.3.0
bitnami pillow
>=5.2.0, <12.3.0
12.3.0

Affected products

  • python-pillow Pillow

Classification

Weakness

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.