high 7.5

CVE-2026-59205 json

Pillow: Controlled heap out-of-bounds write in `ImageCmsTransform.apply()` via output mode mismatch

published 2026-07-14 3 mo ago modified 2026-10-24 15 d ago also BIT-pillow-2026-59205 , EUVD-2026-43746 , GHSA-9hw9-ch79-4vh6 , PYSEC-2026-3453

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 32%
public exploits: 0; none known

Pillow is a Python imaging library. Prior to 12.3.0, Pillow's ImageCms.ImageCmsTransform.apply(im, imOut) API can trigger controlled native heap corruption when the caller supplies an output image whose mode does not match the transform's declared output mode. This issue is fixed in version 12.3.0.

Patch / fix

fixed in 3 distros 4 links 3

pypi pillow 12.3.0
bitnami pillow 12.3.0
python pillow 12.3.0

debian ubuntu suse opensuse

pillow Debian 14 12.3.0-1

debian advisories DEBIAN-CVE-2026-59205

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-2026-59205

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

python-Pillow openSUSE Leap 16.0 11.3.0-160000.8.1

opensuse advisories openSUSE-SU-2026:21544-1

github.com/python-pillow/Pillow@a9ffc42 commit
github.com/python-pillow/Pillow#9715 pull request
github.com/python-pillow/Pillow/releases/tag/12.3.0 release

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-2026-59205 updated 2026-11-04 cvss 7.5

Pillow: Pillow: Controlled native heap corruption in ImageCms.ImageCmsTransform.apply API

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-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
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-vllm-gaudi-rhel9, rhoai/odh-llama-stack-core-rhel9, rhoai/odh-caikit-tgis-serving-rhel9, rhoai/odh-trustyai-nemo-guardrails-server-rhel9, rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9
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 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

show 14 more

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 OpenShift AI 3.3 rhoai/odh-llm-d-inference-scheduler-rhel9 1789662430
fixed: vendor fix RHSA-2026:73987
Red Hat OpenShift AI 3.4 rhoai/odh-automl-rhel9 1786612415, rhoai/odh-mlflow-rhel9 1787226790, rhoai/odh-autorag-rhel9 1786612637, rhoai/odh-llm-d-kv-cache-rhel9 1787169432, 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 Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-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 Enterprise Linux AI 3.3 rhelai3/bootc-rocm-rhel9 1788260620, rhelai3/bootc-azure-rocm-rhel9 1788273908
not affected: vulnerable code not present
Red Hat OpenShift AI (RHOAI) rhoai/odh-caikit-nlp-rhel9, rhoai/odh-kserve-agent-rhel9, rhoai/odh-kserve-router-rhel9, rhoai/odh-kserve-controller-rhel9, rhoai/odh-kserve-autogluon-server-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, +2 more
not affected: component not present
Red Hat OpenShift AI 3.3 rhoai/odh-cli-rhel9 1790070206, rhoai/rhai-cli-rhel9 1790070206, rhoai/odh-mlflow-rhel9 1789653606, rhoai/odh-trainer-rhel9 1790136369, rhoai/odh-maas-api-rhel9 1790131842, rhoai/odh-mlserver-rhel9 1789121365, +76 more Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1787330837, rhoai/rhai-cli-rhel9 1787330837, rhoai/odh-trainer-rhel9 1787089049, rhoai/odh-eval-hub-rhel9 1787087463, rhoai/odh-maas-api-rhel9 1787153683, rhoai/odh-mlserver-rhel9 1786611800, +76 more Red Hat Quay 3.9 quay/clair-rhel8 1785563558, quay/quay-builder-rhel8 1785563573, quay/quay-operator-rhel8 1785563557, quay/quay-operator-bundle 1785954125, quay/quay-bridge-operator-rhel8 1785563571, quay/quay-bridge-operator-bundle 1785564443, +3 more Red Hat Quay 3.10 quay/clair-rhel8 1786394800, quay/quay-builder-rhel8 1786394811, quay/quay-operator-rhel8 1786394797, quay/quay-operator-bundle 1786398374, quay/quay-bridge-operator-rhel8 1786394781, quay/quay-bridge-operator-bundle 1786395288, +3 more Red Hat Quay 3.12 quay/clair-rhel8 1786170209, quay/quay-builder-rhel8 1786170241, quay/quay-operator-rhel8 1786170245, quay/quay-operator-bundle 1786174731, quay/quay-bridge-operator-rhel8 1786170019, quay/quay-bridge-operator-bundle 1786171106, +3 more Red Hat Quay 3.14 quay/clair-rhel8 1788593782, quay/quay-builder-rhel8 1788593707, quay/quay-operator-rhel8 1788593658, quay/quay-operator-bundle 1788598271, quay/quay-bridge-operator-rhel8 1788594258, quay/quay-bridge-operator-bundle 1788595604, +3 more

+5 more productsfewer

Red Hat Quay 3.15 quay/clair-rhel8 1785177181, quay/quay-builder-rhel8 1785180550, quay/quay-operator-rhel8 1785177009, quay/quay-operator-bundle 1785322285, quay/quay-bridge-operator-rhel8 1785177338, quay/quay-bridge-operator-bundle 1785274696, +3 more Red Hat Quay 3.16 quay/clair-rhel9 1789191202, quay/quay-builder-rhel9 1789492236, quay/quay-operator-rhel9 1789190909, quay/quay-operator-bundle 1789627085, quay/quay-bridge-operator-rhel9 1789191073, quay/quay-bridge-operator-bundle 1789191920, +3 more Red Hat Quay 3.17 quay/clair-rhel9 1786181669, quay/quay-builder-rhel9 1786181688, quay/quay-operator-rhel9 1786181701, quay/quay-operator-bundle 1786429805, quay/quay-bridge-operator-rhel9 1786181654, quay/quay-bridge-operator-bundle 1786182526, +3 more Red Hat Quay 3.18 quay/clair-rhel9 1791279250, quay/quay-builder-rhel9 1791305715, quay/quay-rhel9-operator 1791305677, quay/quay-operator-bundle 1791306533, quay/quay-bridge-rhel9-operator 1791279118, quay/quay-bridge-operator-bundle 1791298533, +3 more Red Hat Satellite 6 python-pillow 10.3.0-1.el9ap, python-pillow 12.2.0-1.el8pc

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: 3 mo ago (2026-07-14)

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/python-pillow/Pillow/security/advisories/GHSA-9hw9-ch79-4vh6 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-787 Out-of-bounds Write

References

github.com /python-pillow/Pillow/pull/9715
web, issue-tracking, patch
github.com /python-pillow/Pillow/commit/a9ffc42bedf4fc0a7ef8d6486e7f9e81e3397721
web, patch
github.com /python-pillow/Pillow/security/advisories/GHSA-9hw9-ch79-4vh6
exploit, web, vendor-advisory, advisory, evidence
github.com /python-pillow/Pillow/releases/tag/12.3.0
web, release-notes, article, advisory
nvd.nist.gov /vuln/detail/CVE-2026-59205
advisory, web
github.com /pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2026-3453.yaml
web
github.com /python-pillow/Pillow
package

Sources

Fencer Vulns 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.

Summary