GHSA-g867-7843-wf8q: pypdf (CVE-2026-59935)

Package	Ecosystem	Affected	Fixed in
pypdf	PyPI	<6.14.2	6.14.2

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

pypdf versions before 6.14.2 are vulnerable to a denial of service caused by an infinite loop when parsing a page's content stream containing an unterminated inline image that uses the ASCII85 or ASCIIHex filter. An attacker who supplies a crafted PDF can trigger this when the page text is extracted or the content stream is otherwise parsed. Upgrade to pypdf 6.14.2 or later. The source gives no other workaround beyond applying an unlisted patch.

Written 4 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.7	High	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0062, the 50th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

8 Jul 2026, 20:16 UTC Confirmed by NVD
31 Oct 2026, 14:29 UTC First seen by agentprime
31 Oct 2026, 14:29 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.