GHSA-62m5-6wh8-28x7: pypdf (CVE-2026-119208)

Package	Ecosystem	Affected	Fixed in
pypdf	PyPI	<6.21.3	6.21.3

Machine-written summary

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

The pypdf Python package, versions before 6.21.3, can be made to run for a long time or use large amounts of memory when processing an encrypted PDF. An attacker would need to supply a crafted encrypted PDF whose declared page count value is wrong, and the impact occurs when the page count is read. The fix is to upgrade to pypdf 6.21.3; the source also suggests applying the changes from PR #4270 if an upgrade is not yet possible.

Written 31 Oct 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
7.1	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0022, the 12th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

29 Oct 2026, 20:41 UTC Confirmed by the CVE List
29 Oct 2026, 21:17 UTC Confirmed by NVD
31 Oct 2026, 14:07 UTC First seen by agentprime
31 Oct 2026, 14:07 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.