Pillow is a Python imaging library. From 5.3.0 until 13.0.0, Pillow can return uninitialized memory as pixels when libtiff performs a short decode of JPEG-compressed or Group 4 fax TIFF data. The _decodeStrip and _decodeTile buffers can be larger than the bytes written by libtiff, but Pillow converts the expected rows without clearing the unwritten tail. The tile path is affected from 5.3.0 and the strip path from 6.0.0. An attacker can supply a crafted TIFF to an application that loads and returns or re-encodes its pixels. This can disclose stale heap contents without memory corruption or a process crash. This issue is fixed in version 13.0.0.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/python-pillow/Pillow/commit/1d4773e6cea0c4a2814e6d4cdc099bbcf56da6ce Patch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-q45j-58j2-45rg Exploit, Patch, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-q45j-58j2-45rg Exploit, Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 6
- Cpes+1 CPE criteria (now 1)NVD modified 2026-10-27 14:55
- StatusPublished → AnalyzedNVD modified 2026-10-27 14:55
- StatusUndergoing Analysis → PublishedNVD modified 2026-10-22 21:13
- StatusPublished → Undergoing AnalysisNVD modified 2026-10-20 19:48
- StatusReceived → PublishedNVD modified 2026-10-19 22:00
- First seenCVSS 8.7NVD modified 2026-10-19 22:17
Affected (CPE criteria) 1
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
References 4
- https://github.com/python-pillow/Pillow/commit/1d4773e6cea0c4a2814e6d4cdc099bbcf56da6ce Patch
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 Release Notes
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-q45j-58j2-45rg Exploit, Patch, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-q45j-58j2-45rg Exploit, Patch, Vendor Advisory