GitHub Advisoryadvisory · PyPI

GHSA-g867-7843-wf8q pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)

HIGH Published 2026-07-23 Modified 2026-07-23 Official page ↗
Aliases
CVE-2026-59935
Ecosystem
PyPI
Packages
pypdf
Severity
High
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weaknesses
CWE-835
Reviewed
2026-07-23

Affected packages

• PyPI pypdf: < 6.14.2 → fixed in 6.14.2

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires parsing the content stream of a page with a not terminated inline image, as done when extracting the page text for example. It only affects the ASCII85 and ASCIIHex filters. Patches This has been fixed in pypdf==6.14.2. Workarounds If you cannot upgrade yet, consider applying the changes from PR #3892.

Related

Alias · CVE (1)

  • CVE-2026-59935 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References