VulnerabilityAnalyzed

CVE-2026-24688

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.

MEDIUM 5.1EPSS 0.40%

Does this matter?

Lower severity and a low EPSS score (0.40%). Track it; it rarely justifies an emergency change on its own.

Description

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.

CVSS 4.0: 5.1 MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.40% probability · 34th percentile
CISA KEV: Not listed
Weakness: CWE-835
Affected: pypdf project/pypdf
Source: security-advisories@github.com

References

https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1Patch
https://github.com/py-pdf/pypdf/pull/3610Issue Tracking
https://github.com/py-pdf/pypdf/releases/tag/6.6.2Product, Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.