CVE-2026-59203: 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

mediumCVSS 5.3CVE-2026-59203

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.3
Published: 2026-07-14
Last updated: 2026-07-15
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-59203

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-592030.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59203	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumGHSA-pg7v-jwj7-p798: Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of se…ghsa

Recent advisories for Pillow is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEW] [medium] Red Hat Enterprise Linux (python-pillow): Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-31
high[NEW] [high] Red Hat Enterprise Linux (Pillow): Multiple vulnerabilitiescert-bund · 2026-07-31
high[NEW] [high] Red Hat Satellite (foreman, python-pillow, go): Multiple vulnerabilitiescert-bund · 2026-07-30
highGHSA-9hw9-ch79-4vh6: Pillow: Controlled heap out-of-bounds write in Pillow `ImageCmsTransform.apply()` via out…ghsa · 2026-07-20
highGHSA-vjc4-5qp5-m44j: Pillow JPEG2000 tiled decode retains a growing scratch buffer and can be used for denial …ghsa · 2026-07-20
mediumGHSA-pg7v-jwj7-p798: Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of se…ghsa · 2026-07-20