CVE-2026-119206: pypdf has possible long runtimes when retrieving page labels

October 30, 2026

An attacker who uses this vulnerability can craft a PDF which leads to large runtimes. This requires retrieving the page labels of a file.

References

github.com/advisories/GHSA-42gh-23hr-vphw
github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e
github.com/py-pdf/pypdf/pull/4251
github.com/py-pdf/pypdf/releases/tag/6.21.3
github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw
nvd.nist.gov/vuln/detail/CVE-2026-119206

Code Behaviors & Features

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