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TI-2026-42347 Aliases CVE-2026-59200GHSA-jjj6-mw9f-p565

Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()

Priority HIGH 72CWE-400Published · 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: 14 fixed, 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

Pillow is a Python imaging library. From 5.1.0 until 12.3.0, PdfParser.PdfStream.decode() in PIL/PdfParser.py calls zlib.decompress() with bufsize set to the PDF stream Length field without bounding the decompressed output size, allowing a crafted FlateDecode PDF stream to exhaust memory from a small file. 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: 25 advisoriesRed Hat: 14 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-pillowPillow5.1.0 to before 12.3.012.3.0Patch availableCNA
—Pillow (PyPI)5.1.0 to before 12.3.012.3.0Patch availableGHSA-jjj6-mw9f-p565
  • Pillow Vendorpython-pillow Affected 5.1.0 to before 12.3.0 Fixed in 12.3.0 Patch available CNA
  • Pillow (PyPI) Vendor— Affected 5.1.0 to before 12.3.0 Fixed in 12.3.0 Patch available GHSA-jjj6-mw9f-p565

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*5.1.0 to before 12.3.0Vulnerablepython-pillow
  • cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:* Versions 5.1.0 to before 12.3.0 Vulnerable ·python-pillow

Remediation

  • Fix · CNA Pillow (python-pillow) Fixed in 12.3.0
  • Fix · GHSA-jjj6-mw9f-p565 Pillow (PyPI) Fixed in 12.3.0 Advisory →

Red Hat 25 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 22 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-2026:60520 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 3.3Fixed 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-2026-59200
  2. 2026-10-03 Alias added: GHSA-jjj6-mw9f-p565
  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 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