CVE-2026-33699: pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

March 25, 2026 (updated March 27, 2026)

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode.

References

github.com/advisories/GHSA-87mj-5ggw-8qc3
github.com/py-pdf/pypdf
github.com/py-pdf/pypdf/pull/3693
github.com/py-pdf/pypdf/releases/tag/6.9.2
github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3
nvd.nist.gov/vuln/detail/CVE-2026-33699

Code Behaviors & Features

Detect and mitigate CVE-2026-33699 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →