Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/python-pillow/Pillow/commit/e7794835e323ff2691d9b3a974cade1a44301b9a Patch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-24rc-8hj2-v98c 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 14:25
- StatusAwaiting Analysis → AnalyzedNVD modified 2026-10-27 14:25
- StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 16:46
- StatusReceived → PublishedNVD modified 2026-10-21 20:47
- StatusPublished → ReceivedNVD modified 2026-10-21 21:20
- First seenCVSS 6.5 · python-pillowNVD modified 2026-10-21 20:47
Affected (CPE criteria) 1
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
References 4
- https://github.com/python-pillow/Pillow/commit/e7794835e323ff2691d9b3a974cade1a44301b9a Patch
- https://github.com/python-pillow/Pillow/pull/10015 Issue Tracking
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 Release Notes
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-24rc-8hj2-v98c Vendor Advisory