CVE-2026-55379

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.

CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-789 CWE-789

References

Other References

https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc

Frequently Asked Questions

What is CVE-2026-55379? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-55379? +

CVE-2026-55379 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-55379? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-26618

Erlang is a programming language and runtime system for building massively scalable soft real-time systems with requirements on high availability. …

CVE-2026-53428

Memory Allocation with Excessive Size Value vulnerability in leandrocp mdex allows an unauthenticated attacker to cause a denial of service …

CVE-2024-20260 8.6

A vulnerability in the VPN and management web servers of the Cisco Adaptive Security Virtual Appliance (ASAv) and Cisco Secure …

CVE-2026-40303 7.5

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, endpoints.GetSessionCookie parses an attacker-supplied cookie …

CVE-2026-33524 7.5

Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, …

CVE-2018-25368 7.5

Nord VPN 6.14.31 contains a denial of service vulnerability that allows unauthenticated attackers to crash the application by submitting an …