CVE-2026-33699

HIGH

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 v3.1 Score

7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 3/27/2026Modified: 4/1/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-33699 — pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2...

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.

CVE-2026-33699
NIST NVD

References (3)

https://github.com/py-pdf/pypdf/pull/3693Issue TrackingPatchhttps://github.com/py-pdf/pypdf/releases/tag/6.9.2ProductRelease Noteshttps://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3PatchVendor Advisory