Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes() without calling Image._decompression_bomb_check(), allowing crafted PCF font data to cause excessive memory allocation. This issue is fixed in version 12.3.0.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d Patch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x Exploit, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · pythonNVD modified 2026-10-25 20:10
Affected (CPE criteria) 1
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
References 4
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst Release Notes
- https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d Patch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x Exploit, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x Exploit, Vendor Advisory