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TI-2026-79004 Aliases CVE-2026-96639GHSA-v9pv-5gc8-w2m6

Pillow multi-frame loaders reuse stale native image storage

Priority MEDIUM 50CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 1 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 from 11.0.0 before 13.0.0 is affected. Multi-frame loaders can reuse a native image allocation made for a narrow frame mode after a later frame of the same size switches to wider RGB or CMYK data, because the stored mode and size are not checked. This out-of-bounds write (CWE-787) lets a remote attacker without privileges or user interaction crash the process with crafted PSD, MPO, DCX, or MIC images. The MPO path can also cause a native over-read and, in demonstrated runtime-specific profiles, command execution.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

Pillow is a Python imaging library. From 11.0.0 until 13.0.0, multi-frame loaders can retain an ImagingCore allocation created for a narrow frame mode while a later frame of the same dimensions changes the logical mode and decoder tiles to wider RGB or CMYK data. ImageFile.load_prepare() reuses the stale native storage because _im is non-null without verifying that its mode and size still match. Crafted PSD, MPO, DCX, or MIC frame transitions can then write wider pixels into the narrow allocation, causing native out-of-bounds writes and crashes. The MPO path can also cause a native over-read and, in demonstrated runtime-specific profiles, command execution. This issue is fixed in version 13.0.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00659 51st percentileScored 2026-11-07
Fix Partial Pillow (python-pillow): 13.0.0Pillow (PyPI): 13.0.0Red Hat: 6 advisoriesRed Hat: 1 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

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-pillowPillow11.0.0 to before 13.0.013.0.0Patch availableCNA
—Pillow (PyPI)11.0.0 to before 13.0.013.0.0Patch availableGHSA-v9pv-5gc8-w2m6
  • Pillow Vendorpython-pillow Affected 11.0.0 to before 13.0.0 Fixed in 13.0.0 Patch available CNA
  • Pillow (PyPI) Vendor— Affected 11.0.0 to before 13.0.0 Fixed in 13.0.0 Patch available GHSA-v9pv-5gc8-w2m6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*11.0.0 to before 13.0.0Vulnerablepython-pillow
  • cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:* Versions 11.0.0 to before 13.0.0 Vulnerable ·python-pillow

Remediation

Upgrade Pillow to version 13.0.0, which fixes this flaw in the PyPI package. Red Hat AI Inference Server 3.5 is fixed by RHSA-2026:94738, RHSA-2026:94721, RHSA-2026:94717, RHSA-2026:94715, RHSA-2026:94709 and RHSA-2026:94702. Red Hat lists Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) and Red Hat Satellite 6 as affected without a fix, with no plan available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

  • Fix · CNA Pillow (python-pillow) Fixed in 13.0.0
  • Fix · GHSA-v9pv-5gc8-w2m6 Pillow (PyPI) Fixed in 13.0.0 Advisory →

Red Hat 6 advisories

  • RHSA-2026:94738 Released 2026-11-03 · Red Hat rating Critical
    Red Hat AI Inference 3.5.3 (CUDA)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-cuda-rhel9
  • RHSA-2026:94721 Released 2026-11-03 · Red Hat rating Critical
    Red Hat AI Inference Tech Preview 3.5.3 (Gaudi)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-gaudi-rhel9
  • RHSA-2026:94717 Released 2026-11-03 · Red Hat rating Critical
    Red Hat AI Inference 3.5.3 (Spyre)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-spyre-rhel9
Show 3 more Red Hat advisories
  • RHSA-2026:94715 Released 2026-11-03 · Red Hat rating Critical
    Red Hat AI Inference Model Optimization Tools 3.5.3 (CUDA)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/model-opt-cuda-rhel9
  • RHSA-2026:94709 Released 2026-11-03 · Red Hat rating Critical
    Red Hat AI Inference 3.5.3 (ROCm)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-rocm-rhel9
  • RHSA-2026:94702 Released 2026-11-03 · Red Hat rating Critical
    Red Hat AI Inference 3.5.3 (CPU)
    • Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-cpu-rhel9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix yet
Red Hat AI Inference ServerAffectedNo fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet
Red Hat Satellite 6AffectedNo fix yet
Red Hat AI Inference Server 3.5Fixed RHSA-2026:94702, RHSA-2026:94709, RHSA-2026:94715, RHSA-2026:94717, RHSA-2026:94721, RHSA-2026:94738
Not affected: 4 products
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat OpenShift AI (RHOAI)

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-96639
  2. 2026-10-22 Alias added: GHSA-v9pv-5gc8-w2m6
  3. 2026-10-22 Fix available: PyPI/[email protected] · GHSA-v9pv-5gc8-w2m6
  4. 2026-10-22 CVSS score added · GHSA-v9pv-5gc8-w2m6
  5. 2026-10-22 Weakness changed · GHSA-v9pv-5gc8-w2m6
  6. 2026-10-22 6 new references · GHSA-v9pv-5gc8-w2m6
  7. 2026-10-25 EPSS moved to the 50th–90th percentile
  8. 2026-10-29 CISA SSVC decision points changed
  9. 2026-11-03 Affected versions changed · Red Hat
  10. 2026-11-03 Affected versions changed · Red Hat
  11. 2026-11-03 Affected versions changed · Red Hat
  12. 2026-11-04 Fix available: RHSA-2026:94717 · Red Hat
  13. 2026-11-04 Fix available: RHSA-2026:94715 · Red Hat
  14. 2026-11-04 Fix available: RHSA-2026:94709 · Red Hat
  15. 2026-11-04 Fix available: RHSA-2026:94738 · Red Hat
  16. 2026-11-04 Fix available: RHSA-2026:94702 · Red Hat
  17. 2026-11-04 Fix available: RHSA-2026:94721 · Red Hat
  18. 2026-11-04 Fix available: Red Hat AI Inference Server 3.5 · Red Hat
  19. 2026-11-06 Affected versions changed · Red Hat
  20. 2026-11-06 Affected versions changed · Red Hat
  21. 2026-11-07 Affected versions changed · Red Hat

References

Patch 1

Advisory 2

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

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