CVE-2026-54059

HIGH

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

Title source: cna
STIX 2.1

Description

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.

References (3)

Core 3

Scores

CVSS v3 7.5
EPSS 0.0035
EPSS Percentile 27.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-789
Status published
Products (2)
python/pillow < 12.3.0
python-pillow/Pillow < 12.3.0
Published Jul 06, 2026
Tracked Since Jul 07, 2026