Vulnerability record · CVE-2026-55379 · published 6 July 2026

CVE-2026-55379: Python pillow vulnerability

Python · Pillow

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.

7.5 CVSS 3.1 High EPSS 0.65% · top 51.0% CWE-789 · CWE-789

7.5CVSS 3.1 base score

0.65%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

4References, 2 tagged exploit

7 Jul 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Pillow Python

References

Link	Tags
https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst	Release Notes
https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d	Patch
https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc	ExploitVendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc	ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-55379), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.