CVE-2026-22690
Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values.
Does this matter?
Lower severity and a low EPSS score (0.44%). Track it; it rarely justifies an emergency change on its own.
Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
- CVSS 4.0
- 2.7 LOWCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.44% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- pypdf project/pypdf
- Source
- security-advisories@github.com
References
- https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45Patch
- https://github.com/py-pdf/pypdf/pull/3594Issue Tracking, Patch
- https://github.com/py-pdf/pypdf/releases/tag/6.6.0Release Notes
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-4xc4-762w-m6cgMitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.