VulnerabilityAnalyzed
CVE-2026-33699
Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop.
MEDIUM 4.6EPSS 0.46%
Does this matter?
Lower severity and a low EPSS score (0.46%). Track it; it rarely justifies an emergency change on its own.
Description
pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.
- CVSS 4.0
- 4.6 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/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
- 0.46% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-835
- Affected
- pypdf project/pypdf
- Source
- security-advisories@github.com
References
- https://github.com/py-pdf/pypdf/pull/3693Issue Tracking, Patch
- https://github.com/py-pdf/pypdf/releases/tag/6.9.2Product, Release Notes
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.