CVE-2026-59199: Pillow is a Python imaging library. Prior to 12.3.0, Pillow public image coordinate APIs can trigger a native heap out-of-bounds write when given coordinates near the signed 32-bit

highCVSS 7.5CVE-2026-59199

Pillow is a Python imaging library. Prior to 12.3.0, Pillow public image coordinate APIs can trigger a native heap out-of-bounds write when given coordinates near the signed 32-bit integer limits in Image.paste(), Image.crop(), or Image.alpha_composite(). This issue is fixed in version 12.3.0.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.5
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-2026-59199

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-2026-591990.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59199	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highGHSA-6r8x-57c9-28j4: Pillow: Heap out-of-bounds write `Image.paste()` / `Image.crop()` via signed coordinate o…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