pypdf has possible long runtimes for wrong size values in cross-reference and object streams
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size` values or object streams with wrong large `/N` values. This has been fixed in pyp…
Severity medium: primary CNA CVSS 6.9 v4.0 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-04-22T20:49:10.401Z. Updated 2026-04-23T16:24:48.712Z.