CVE-2026-54059

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.3%

EPSS Percentile

25th

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.

CWE	CWE-789
Vendor	python-pillow
Product	pillow
Published	Jul 6, 2026
Last Updated	Jul 7, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

python-pillow / Pillow

< 12.3.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x github.com: https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d github.com: https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst