CVE-2026-49461

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting the text of a page which contains a form XObject with self-references. This vulnerability is fixed in 6.12.2.

Score

CVSS 4.0 6.9 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-06-22

Last modified

2026-10-25

Weaknesses

CWE-400

Affected products

• Pypdf (Py-pdf)
• Pypdf (Pypdf Project)

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-j543-4vmf-qm7v
• https://github.com/py-pdf/pypdf/pull/3805
• https://github.com/py-pdf/pypdf/releases/tag/6.12.2