CVE-2026-54531: pypdf: Possible infinite loop when processing outlines/bookmarks in writer

June 16, 2026

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer.

References

github.com/advisories/GHSA-m2v9-299j-rv96
github.com/py-pdf/pypdf/pull/3830
github.com/py-pdf/pypdf/releases/tag/6.13.0
github.com/py-pdf/pypdf/security/advisories/GHSA-m2v9-299j-rv96
nvd.nist.gov/vuln/detail/CVE-2026-54531

Code Behaviors & Features

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