CVE-2026-102995: pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)

October 1, 2026

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

References

github.com/advisories/GHSA-fp3h-c4fm-7vvf
github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51
github.com/py-pdf/pypdf/pull/4071
github.com/py-pdf/pypdf/releases/tag/6.18.1
github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf
nvd.nist.gov/vuln/detail/CVE-2026-102995

Code Behaviors & Features

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