CVE-2026-102996: pypdf: Possible large memory usage when parsing font data

October 1, 2026

An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the /Widths entry of a TrueType or Type1 fonts with unusually large values, for example during text extraction.

References

github.com/advisories/GHSA-g9cg-prrw-2r8q
github.com/py-pdf/pypdf/commit/0fb26eb8cdd01c44b3b2c9fe8329751be2f7cfd5
github.com/py-pdf/pypdf/pull/4072
github.com/py-pdf/pypdf/releases/tag/6.18.1
github.com/py-pdf/pypdf/security/advisories/GHSA-g9cg-prrw-2r8q
nvd.nist.gov/vuln/detail/CVE-2026-102996

Code Behaviors & Features

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