What’s Vulnerable › Vulnerabilities

CVE-2026-59198: Pillow TGA RLE encoder can serialize up to ~57 KB of adjacent heap data into generated images

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-14 · updated 2026-10-24
• Weakness: CWE-125

Description

Pillow is a Python imaging library. From 5.2.0 until 12.3.0, Pillow's TGA RLE encoder reads past its packed row buffer when saving a mode 1 image with TGA RLE compression, allowing adjacent process heap bytes to be copied into the generated TGA file. This issue is fixed in version 12.3.0.

Affected products

• python-pillow Pillow: from 5.2.0 before 12.3.0 — fixed in 12.3.0
• Pypi Pillow: from 5.2.0 before 12.3.0; 10.0.0, 10.0.1, 10.1.0, 10.2.0, 10.3.0, 10.4.0 (+41) — fixed in 12.3.0

How to fix

Upgrade to a fixed version: python-pillow Pillow 12.3.0; Pypi Pillow 12.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/python-pillow/Pillow/commit/eada3cbd7fb9963ee90673fb7b5270124a0d5f4b
• https://github.com/python-pillow/Pillow/pull/9709
• https://github.com/python-pillow/Pillow/releases/tag/12.3.0
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-fj7v-r99m-22gq
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-fj7v-r99m-22gq

Get alerted when CVE-2026-59198 or the next vulnerability affects your stack