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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-54059US | — | — | ||
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.frombyt… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rstARTICLE
- https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77dFIX
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9xADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-54059WEB
scry
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