CVE-2026-59204 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-59204HIGH

python-pillow Pillow — Pillow JPEG2000 tiled decode retains a growing scratch buffer and can be used for denial of service

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   N   N   H    8.7   .0039   32.7     —

AFFECTED
  Product  Versions              Fixed
  Pillow   >= 8.2.0, < 12.3.0 –  —

TIMELINE
  Jul 2   Reserved by GitHub_M
  Jul 14  EXPLOIT PUBLISHED — CVE-2026-59204 (python-pillow Pillow). Public exploit reference added.
  Jul 14  Published (CNA: GitHub_M)
  Jul 21  EXPLOIT PUBLISHED — CVE-2026-59204 (python-pillow Pillow). Public exploit reference added.

CWE-770, CWE-789 · CNA: GitHub_M · CVSS v4.0 · 4 references · NVD status: Modified

Description

Pillow is a Python imaging library. From 8.2.0 through 12.2.0, src/libImaging/Jpeg2KDecode.c accumulates total_component_width across every tile in a JPEG2000 image instead of recomputing it per tile, allowing a crafted tiled JPEG2000 file to force substantially higher transient memory usage and trigger out-of-memory failures during decoding. This issue is fixed in version 12.3.0.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 2, 2026	Reserved	Reserved by GitHub_M
July 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-59204 (python-pillow Pillow). Public exploit reference added.
July 14, 2026	Published	Published (CNA: GitHub_M)
July 21, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-59204 (python-pillow Pillow). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
python-pillow	Pillow	—	>= 8.2.0, < 12.3.0	—

Weaknesses

CWE-770 · CWE-789

References (4)

https://github.com/python-pillow/Pillow/commit/13ada41172142f2fd9f0906f615a00ea623a11ca [Patch]
https://github.com/python-pillow/Pillow/pull/9704 [Exploit, Issue Tracking, Patch]
https://github.com/python-pillow/Pillow/releases/tag/12.3.0 [Release Notes]
https://github.com/python-pillow/Pillow/security/advisories/GHSA-vjc4-5qp5-m44j [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-59204 at cve.org

Vendors: python-pillow

Weaknesses: CWE-770 · CWE-789

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-59204 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.