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TI-2026-42350 Aliases CVE-2026-59205GHSA-9hw9-ch79-4vh6

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

Priority HIGH 72CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 15 fixed, 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00385 32nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Pillow (python-pillow): 12.3.0pillow (PyPI): 12.3.0Red Hat: 28 advisoriesRed Hat: 15 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
python-pillowPillowbefore 12.3.012.3.0Patch availableCNA
—pillow (PyPI)before 12.3.012.3.0Patch availableGHSA-9hw9-ch79-4vh6
  • Pillow Vendorpython-pillow Affected before 12.3.0 Fixed in 12.3.0 Patch available CNA
  • pillow (PyPI) Vendor— Affected before 12.3.0 Fixed in 12.3.0 Patch available GHSA-9hw9-ch79-4vh6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*before 12.3.0Vulnerablepython-pillow
  • cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:* Versions before 12.3.0 Vulnerable ·python-pillow

Remediation

  • Fix · CNA Pillow (python-pillow) Fixed in 12.3.0
  • Fix · GHSA-9hw9-ch79-4vh6 pillow (PyPI) Fixed in 12.3.0 Advisory →

Red Hat 28 advisories

  • RHSA-2026:81110 Released 2026-10-12 · Red Hat rating Important
    Red Hat Quay 3.18.1
    • Red Hat Quay 3.18 registry.redhat.io/quay/quay-builder-rhel9, registry.redhat.io/quay/quay-rhel9
  • RHSA-2026:76150 Released 2026-10-05 · Red Hat rating Important
    Red Hat Enterprise Linux AI 3.4.5 security update
    • Red Hat Enterprise Linux AI 3.4 registry.redhat.io/rhelai3/bootc-aws-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-rocm-rhel9 +3
  • RHSA-2026:76149 Released 2026-10-05 · Red Hat rating Important
    Red Hat Enterprise Linux AI 3.4.5 security update
    • Red Hat Enterprise Linux AI 3.4 registry.redhat.io/rhelai3/disk-image-cuda-rhel9
Show 25 more Red Hat advisories
  • RHSA-2026:73987 Released 2026-09-30 · Red Hat rating Critical
    RHOAI 3.3.7 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.3 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-dashboard-rhel9, registry.redhat.io/rhoai/odh-data-science-pipelines-argo-argoexec-rhel9 +47
  • RHSA-2026:70996 Released 2026-09-23 · Red Hat rating Important
    Red Hat AI Inference Model Optimization Tools 3.4.5 (cuda)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/model-opt-cuda-rhel9
  • RHSA-2026:70995 Released 2026-09-23 · Red Hat rating Important
    Red Hat AI Inference 3.4.5 (rocm)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/vllm-rocm-rhel9
  • RHSA-2026:70979 Released 2026-09-23 · Red Hat rating Important
    Red Hat AI Inference 3.4.5 (cuda)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/vllm-cuda-rhel9
  • RHSA-2026:70969 Released 2026-09-23 · Red Hat rating Important
    Red Hat AI Inference 3.4.5 (spyre)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/vllm-spyre-rhel9
  • RHSA-2026:70965 Released 2026-09-23 · Red Hat rating Important
    Red Hat AI Inference 3.4.5 (cpu)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/vllm-cpu-rhel9
  • RHSA-2026:70267 Released 2026-09-22 · Red Hat rating Important
    Red Hat Quay 3.14.9
    • Red Hat Quay 3.14 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:69469 Released 2026-09-21 · Red Hat rating Important
    Red Hat AI Inference 3.4.5 (rocm)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/vllm-rocm-rhel9
  • RHSA-2026:69468 Released 2026-09-21 · Red Hat rating Important
    Red Hat AI Inference Model Optimization Tools 3.4.5 (cuda)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/model-opt-cuda-rhel9
  • RHSA-2026:69467 Released 2026-09-21 · Red Hat rating Important
    Red Hat AI Inference 3.4.5 (cuda)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/vllm-cuda-rhel9
  • RHSA-2026:69466 Released 2026-09-21 · Red Hat rating Important
    Red Hat AI Inference 3.4.5 (cpu)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/vllm-cpu-rhel9
  • RHSA-2026:69464 Released 2026-09-21 · Red Hat rating Important
    Red Hat AI Inference 3.4.5 (spyre)
    • Red Hat AI Inference Server 3.4 registry.redhat.io/rhaii/vllm-spyre-rhel9
  • RHSA-2026:69255 Released 2026-09-21 · Red Hat rating Important
    Red Hat Quay 3.16.6
    • Red Hat Quay 3.16 registry.redhat.io/quay/quay-rhel9
  • RHSA-2026:62336 Released 2026-09-01 · Red Hat rating Important
    Red Hat Enterprise Linux AI 3.3.6 enhancement update
    • Red Hat Enterprise Linux AI 3.3 registry.redhat.io/rhelai3/bootc-aws-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-rocm-rhel9 +3
  • RHSA-2026:62335 Released 2026-09-01 · Red Hat rating Important
    Red Hat Enterprise Linux AI 3.3.6 enhancement update
    • Red Hat Enterprise Linux AI 3.3 registry.redhat.io/rhelai3/disk-image-cuda-rhel9
  • RHSA-2026:61629 Released 2026-08-31 · Red Hat rating Important
    Red Hat AI Inference Server 3.2.2 (ROCm)
    • Red Hat AI Inference Server 3.2 registry.redhat.io/rhaiis/vllm-rocm-rhel9
  • RHSA-2026:61628 Released 2026-08-31 · Red Hat rating Important
    Red Hat AI Inference Server Model Optimization Tools 3.2.2 (CUDA)
    • Red Hat AI Inference Server 3.2 registry.redhat.io/rhaiis/model-opt-cuda-rhel9
  • RHSA-2026:61627 Released 2026-08-31 · Red Hat rating Important
    Red Hat AI Inference Server 3.2.2 (CUDA)
    • Red Hat AI Inference Server 3.2 registry.redhat.io/rhaiis/vllm-cuda-rhel9
  • RHSA-2026:60520 Released 2026-08-27 · Red Hat rating Critical
    RHOAI 3.4.4 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-autorag-rhel9, registry.redhat.io/rhoai/odh-built-in-detector-rhel9 +47
  • RHSA-2026:59518 Released 2026-08-25 · Red Hat rating Important
    Red Hat AI Inference Server Model Optimization Tools 3.3.6 (CUDA)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/model-opt-cuda-rhel9
  • RHSA-2026:54395 Released 2026-08-12 · Red Hat rating Important
    Red Hat Quay 3.17.4
    • Red Hat Quay 3.17 registry.redhat.io/quay/quay-rhel9
  • RHSA-2026:53520 Released 2026-08-11 · Red Hat rating Important
    Red Hat Quay 3.10.25
    • Red Hat Quay 3.10 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:52968 Released 2026-08-10 · Red Hat rating Important
    Red Hat Quay 3.12.21
    • Red Hat Quay 3.12 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:50931 Released 2026-08-05 · Red Hat rating Important
    Red Hat Quay 3.9.25
    • Red Hat Quay 3.9 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:48933 Released 2026-07-30 · Red Hat rating Important
    Red Hat Quay 3.15.7
    • Red Hat Quay 3.15 registry.redhat.io/quay/quay-rhel8

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Lightspeed CoreAffectedNo fix yet
OpenShift LightspeedAffectedNo fix yet
Red Hat AI Inference ServerAffectedNo fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix planned: Will not fix
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet
Red Hat AI Inference Server 3.2Fixed RHSA-2026:61627, RHSA-2026:61628, RHSA-2026:61629
Red Hat AI Inference Server 3.3Fixed RHSA-2026:59518
Red Hat AI Inference Server 3.4Fixed RHSA-2026:69464, RHSA-2026:69466, RHSA-2026:69467, RHSA-2026:69468, RHSA-2026:69469, RHSA-2026:70965, RHSA-2026:70969, RHSA-2026:70979, RHSA-2026:70995, RHSA-2026:70996
Red Hat Enterprise Linux AI 3.3Fixed RHSA-2026:62335, RHSA-2026:62336
Red Hat Enterprise Linux AI 3.4Fixed RHSA-2026:76149, RHSA-2026:76150
Red Hat OpenShift AI 3.3Fixed RHSA-2026:73987
Red Hat OpenShift AI 3.4Fixed RHSA-2026:60520
Red Hat Quay 3.10Fixed RHSA-2026:53520
Red Hat Quay 3.12Fixed RHSA-2026:52968
Red Hat Quay 3.14Fixed RHSA-2026:70267
Red Hat Quay 3.15Fixed RHSA-2026:48933
Red Hat Quay 3.16Fixed RHSA-2026:69255
Red Hat Quay 3.17Fixed RHSA-2026:54395
Red Hat Quay 3.18Fixed RHSA-2026:81110
Red Hat Quay 3.9Fixed RHSA-2026:50931
Not affected: 18 products
  • Exploit Intelligence
  • OpenShift Lightspeed
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux AI 3.3
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift AI 3.3
  • Red Hat OpenShift AI 3.4
  • Red Hat Quay 3.10
  • Red Hat Quay 3.12
  • Red Hat Quay 3.14
  • Red Hat Quay 3.15
  • Red Hat Quay 3.16
  • Red Hat Quay 3.17
  • Red Hat Quay 3.18
  • Red Hat Quay 3.9
  • Red Hat Satellite 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59205
  2. 2026-10-03 Alias added: GHSA-9hw9-ch79-4vh6
  3. 2026-10-06 Fix available: RHSA-2026:76149 · Red Hat
  4. 2026-10-06 Fix available: RHSA-2026:76150 · Red Hat
  5. 2026-10-06 Fix available: Red Hat Enterprise Linux AI 3.4 · Red Hat
  6. 2026-10-07 Fix available: RHSA-2026:73987 · Red Hat
  7. 2026-10-07 Affected versions changed · Red Hat
  8. 2026-10-09 Affected versions changed · Red Hat
  9. 2026-10-13 Fix available: RHSA-2026:81110 · Red Hat
  10. 2026-10-13 Fix available: Red Hat Quay 3.18 · Red Hat

References

Exploit 1

Patch 2

Advisory 1

Other 3

  • TI-2026-76627 Out-of-bounds read in Pillow TIFF encoder ColorMap handling CVSS 4.0HIGH 8.8
  • TI-2026-76625 Quadratic-time denial of service in Pillow PDF save_all CVSS 4.0HIGH 8.7
  • TI-2026-76605 NULL pointer dereference in Pillow's Image.merge function CVSS 4.0HIGH 8.7
  • TI-2026-76604 Out-of-bounds read in Pillow TIFF decoding leaks heap memory CVSS 4.0HIGH 8.8
  • TI-2026-76602 Double free in Pillow ImagingScaleAffine on allocation failure CVSS 4.0HIGH 8.7
  • TI-2026-76600 GIF seek in Pillow keeps rejected size, allowing denial of service CVSS 4.0HIGH 8.7
See all 110 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences