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TI-2026-76598 Aliases CVE-2026-112398GHSA-5x8w-8jj5-q52h

Heap buffer overflow in Pillow FlashPix JPEG decoding

Priority HIGH 75CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 8 fixed, 8 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-122 and the CVSS impact.

Summary

Pillow before 13.0.0, the Python imaging library, has a heap buffer overflow in its FlashPix JPEG tile decoder (CWE-122). Decoded scanlines can be written beyond the allocated tile buffer, corrupting heap memory. An attacker can supply a crafted FlashPix file to an application that opens or thumbnails untrusted input when the optional olefile dependency is installed, which may allow arbitrary code execution. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's FlashPix JPEG-tile decoder can write decoded scanlines beyond the allocated tile buffer. FlashPix (FPX) JPEG decoding selects raw mode LA with two bytes per pixel, while an unrecognized JPEG mode can be decoded as JCS_UNKNOWN with four components, causing ImagingJpegDecode to write four-component scanlines into the two-byte tile buffer. An attacker can supply a crafted OLE2 FlashPix file to an application with the optional olefile dependency installed that opens or thumbnails untrusted input. This can corrupt heap memory and may allow arbitrary code execution. This issue is fixed in version 13.0.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00696 53rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Pillow (python-pillow): 13.0.0pillow (PyPI): 13.0.0Red Hat: 11 advisoriesRed Hat: 8 fixed, 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
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-pillowPillowbefore 13.0.013.0.0Patch availableCNA
—pillow (PyPI)before 13.0.013.0.0Patch availableGHSA-5x8w-8jj5-q52h
  • Pillow Vendorpython-pillow Affected before 13.0.0 Fixed in 13.0.0 Patch available CNA
  • pillow (PyPI) Vendor— Affected before 13.0.0 Fixed in 13.0.0 Patch available GHSA-5x8w-8jj5-q52h

CPE configurations NVD · 1

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

Remediation

Upgrade the PyPI package pillow to version 13.0.0, which fixes the flaw. Red Hat fixes python-pillow in RHSA-2026:93077 for Red Hat Enterprise Linux AppStream and CRB (v. 8), and fixes Red Hat Satellite 6.16, 6.17, 6.18 and 6.19 in RHSA-2026:95655, RHSA-2026:95656, RHSA-2026:95657 and RHSA-2026:92861. Red Hat lists Red Hat Enterprise Linux 7 as affected without a fix, with plan none_available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA Pillow (python-pillow) Fixed in 13.0.0
  • Fix · GHSA-5x8w-8jj5-q52h pillow (PyPI) Fixed in 13.0.0 Advisory →

Red Hat 11 advisories

  • RHSA-2026:95655 Released 2026-11-05 · Red Hat rating Critical
    Satellite 6.16 EUS security update
    • Red Hat Satellite 6.16 for RHEL 8 openvox-agent-8.32.0-1.el8sat, openvox-server-8.18.0-1.el8sat, python-brotli-1.2.1-1.el8pc +11
    • Red Hat Satellite 6.16 for RHEL 9 openvox-agent-8.32.0-1.el9sat, openvox-server-8.18.0-1.el9sat, python-brotli-1.2.1-1.el9pc +11
  • RHSA-2026:95657 Released 2026-11-05 · Red Hat rating Critical
    Satellite 6.18 security update
    • Red Hat Satellite 6.18 for RHEL 9 openvox-agent-8.32.0-1.el9sat, openvox-server-8.18.0-1.el9sat, python3.12-brotli-1.2.1-1.el9pc +4
  • RHSA-2026:95656 Released 2026-11-05 · Red Hat rating Critical
    Satellite 6.17 security update
    • Red Hat Satellite 6.17 for RHEL 9 openvox-agent-8.32.0-1.el9sat, openvox-server-8.18.0-1.el9sat, python-brotli-1.2.1-1.el9pc +9
Show 8 more Red Hat 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
  • 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
  • RHSA-2026:93077 Released 2026-10-30 · Red Hat rating Critical
    python-pillow security update
    • Red Hat Enterprise Linux AppStream (v. 8) python-pillow-5.1.1-36.el8_10, python3-pillow-5.1.1-36.el8_10
    • Red Hat Enterprise Linux CRB (v. 8) python3-pillow-5.1.1-36.el8_10, python3-pillow-devel-5.1.1-36.el8_10, python3-pillow-doc-5.1.1-36.el8_10 +1
  • RHSA-2026:92861 Released 2026-10-29 · Red Hat rating Critical
    Satellite 6.19 security update
    • Red Hat Satellite 6.19 for RHEL 9 openvox-agent-8.31.1-1.el9sat, openvox-server-8.17.0-1.el9sat, python3.12-brotli-1.2.1-1.el9pc +6

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix yet
Lightspeed CoreAffectedNo fix yet
OpenShift LightspeedAffectedNo fix yet
Red Hat AI Inference ServerAffectedNo fix yet
Red Hat Ansible Automation Platform 2AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet
Red Hat OpenShift AI (RHOAI)AffectedNo 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
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:93077
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:93077
Red Hat Satellite 6.16 for RHEL 8Fixed RHSA-2026:95655
Red Hat Satellite 6.16 for RHEL 9Fixed RHSA-2026:95655
Red Hat Satellite 6.17 for RHEL 9Fixed RHSA-2026:95656
Red Hat Satellite 6.18 for RHEL 9Fixed RHSA-2026:95657
Red Hat Satellite 6.19 for RHEL 9Fixed RHSA-2026:92861
Not affected: 8 products
  • Red Hat Ansible Automation Platform 2
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat Quay 3
  • Red Hat Satellite 6.16 for RHEL 8
  • Red Hat Satellite 6.16 for RHEL 9
  • Red Hat Satellite 6.17 for RHEL 9
  • Red Hat Satellite 6.18 for RHEL 9
  • Red Hat Satellite 6.19 for RHEL 9

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-112398
  2. 2026-10-23 CISA SSVC decision points changed
  3. 2026-10-23 Priority changed: MEDIUM → HIGH
  4. 2026-10-23 Alias added: GHSA-5x8w-8jj5-q52h
  5. 2026-10-23 Fix available: PyPI/[email protected] · GHSA-5x8w-8jj5-q52h
  6. 2026-10-23 CVSS score added · GHSA-5x8w-8jj5-q52h
  7. 2026-10-23 Weakness changed · GHSA-5x8w-8jj5-q52h
  8. 2026-10-23 5 new references · GHSA-5x8w-8jj5-q52h
  9. 2026-10-27 CVSS score added · NVD
  10. 2026-10-28 EPSS moved to the 50th–90th percentile
  11. 2026-10-30 Affected versions changed · Red Hat
  12. 2026-10-30 CVSS score added · Red Hat
  13. 2026-10-30 Affected versions changed · Red Hat
  14. 2026-10-30 Fix available: Red Hat Satellite 6.19 for RHEL 9 · Red Hat
  15. 2026-10-31 Fix available: RHSA-2026:92861 · Red Hat
  16. 2026-10-31 Fix available: RHSA-2026:93077 · Red Hat
  17. 2026-10-31 Fix available: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · Red Hat
  18. 2026-11-04 Fix available: RHSA-2026:94717 · Red Hat
  19. 2026-11-04 Fix available: RHSA-2026:94715 · Red Hat
  20. 2026-11-04 Fix available: RHSA-2026:94709 · Red Hat
  21. 2026-11-04 Fix available: RHSA-2026:94738 · Red Hat
  22. 2026-11-04 Fix available: RHSA-2026:94702 · Red Hat
  23. 2026-11-04 Fix available: RHSA-2026:94721 · Red Hat
  24. 2026-11-04 Fix available: Red Hat AI Inference Server 3.5 · Red Hat
  25. 2026-11-06 Fix available: Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9, Red Hat Satellite 6.17 for RHEL 9 +1 · Red Hat
  26. 2026-11-06 Fix available: RHSA-2026:95656 · Red Hat
  27. 2026-11-06 Fix available: RHSA-2026:95655 · Red Hat
  28. 2026-11-06 Fix available: RHSA-2026:95657 · Red Hat
  29. 2026-11-06 Affected versions changed · Red Hat

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • 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