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

highCVE-2026-59935

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.

Details

Source: GitHub Security Advisories (INTL · database · site)
Severity: high
Published: 2026-07-23
Last updated: 2026-07-23
Exploitation: Not in CISA KEV at last sync

Original advisory: https://github.com/advisories/GHSA-g867-7843-wf8q

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-599350.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59935	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-59935: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.2, an attacker can craf…nvd

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

Details

Exploitation outlook

Referenced CVEs

Same CVEs, other sources

More from GitHub Security Advisories