CVE-2026-27025: pypdf has possible long runtimes/large memory usage for large /ToUnicode streams
(updated )
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and 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-wgvp-vg3v-2xq3
- github.com/py-pdf/pypdf
- github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2
- github.com/py-pdf/pypdf/pull/3646
- github.com/py-pdf/pypdf/releases/tag/6.7.1
- github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3
- nvd.nist.gov/vuln/detail/CVE-2026-27025
Code Behaviors & Features
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