CVE-2026-54531

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer. This vulnerability is fixed in 6.13.0...

CVE-2026-54531 pypdf: Possible infinite loop when processing outlines/bookmarks in writer

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer. This vulnerability is fixed in 6.13.0...

PT-2026-49743

Name of the Vulnerable Software and Affected Versions pypdf versions prior to 6.13.0 Description A flaw in the pure-python PDF library allows an attacker to craft a PDF that triggers an infinite loop. This occurs when merging a file containing outlines into a writer. Recommendations Update to...