CVE-2026-54059

Pillow: PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protection bypass via PCF font loading

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.

Affected

python-pillow · Pillow

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.41% chance of exploitation in the next 30 days, 34th percentile

Published

2026-07-06

Updated

2026-07-07

Proof-of-concept exploits (1)

• advisories/GHSA-8v84-f9pq-wr9x

Security advisories

• python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x
• python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d

References

• CVE Record
• NVD entry