CVE-2026-59203 — 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-2026-59203HIGH

python-pillow Pillow — Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of service

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0040   33.3     —

AFFECTED
  Product  Versions               Fixed
  Pillow   >= 12.0.0, < 12.3.0 –  —

TIMELINE
  Jul 2   Reserved by GitHub_M
  Jul 14  EXPLOIT PUBLISHED — CVE-2026-59203 (python-pillow Pillow). Public exploit reference added.
  Jul 14  Published (CNA: GitHub_M)

CWE-835 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Modified

Description

Pillow is a Python imaging library. From 12.0.0 through 12.2.0, Pillow's EPS parser in PIL/EpsImagePlugin.py accepts a negative byte count in the %%BeginBinary directive, allowing a crafted EPS file to cause Image.open() to seek backwards to the same directive and parse it repeatedly in an infinite loop. This issue is fixed in version 12.3.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 2, 2026	Reserved	Reserved by GitHub_M
July 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-59203 (python-pillow Pillow). Public exploit reference added.
July 14, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
python-pillow	Pillow	—	>= 12.0.0, < 12.3.0	—

Weaknesses

CWE-835

References (4)

https://github.com/python-pillow/Pillow/commit/03992618118b4a76b6163cd72ab5ecd684133b83 [Patch]
https://github.com/python-pillow/Pillow/pull/9708 [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-pg7v-jwj7-p798 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-59203 at cve.org

Vendors: python-pillow

Weaknesses: CWE-835

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-59203 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.