CVE-2026-24688

EUVD-2026-4753
pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects cannot upgrade yet, consider applying the changes from PR #3610 manually.
Infinite Loop
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
4.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
pypdf_projectpypdf
𝑥
< 6.6.2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
pypdf
bookworm
vulnerable
bullseye
postponed
forky
6.9.2-1
fixed
sid
6.9.2-1
fixed
trixie
vulnerable
pypdf2
bookworm
vulnerable
bullseye
vulnerable
trixie
no-dsa
Common Weakness Enumeration
References
https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1
https://github.com/py-pdf/pypdf/pull/3610
https://github.com/py-pdf/pypdf/releases/tag/6.6.2
https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73