Vulnerability in Py-pdf Pypdf

CVE-2026-27628

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.2, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file. This has been fixed in pypdf 6.7.2. As a work…

EPSS: 0.001 (17.6th percentile) — read the EPSS interpretation.

Affected products

Py-pdf Pypdf — versions < 6.7.2

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-2rw7-x74f-jg35 (x_refsource_CONFIRM)
https://github.com/py-pdf/pypdf/issues/3654 (x_refsource_MISC)
https://github.com/py-pdf/pypdf/commit/f0a462d36971cf077d74492a348d0d06fd60ea4d (x_refsource_MISC)