CVE-2026-55379 | THREATINT

Description

Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing excessive memory allocation. This issue is fixed in version 12.3.0.

PUBLISHED Reserved 2026-06-16 | Published 2026-07-06 | Updated 2026-07-06 | Assigner GitHub_M

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

Problem types

CWE-789: Memory Allocation with Excessive Size Value

Product status

< 12.3.0

affected

References

github.com/...Pillow/security/advisories/GHSA-45hq-cxwh-f6vc exploit

github.com/...Pillow/security/advisories/GHSA-45hq-cxwh-f6vc

github.com/...ommit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d

github.com/.../Pillow/blob/main/docs/releasenotes/12.3.0.rst

cve.org (CVE-2026-55379)

nvd.nist.gov (CVE-2026-55379)

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