{"id":"CVE-2026-27025","aliases":["GHSA-wgvp-vg3v-2xq3","PYSEC-2026-3024"],"title":"pypdf has possible long runtimes/large memory usage for large /ToUnicode streams","summary":"pypdf has possible long runtimes/large memory usage for large /ToUnicode streams","severity":"medium","vendor":"pypdf","product":"pypdf","ecosystem":"pip","affected":["pypdf < 6.7.1"],"patched":["pypdf 6.7.1"],"published":"2026-02-18","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:36.045929384Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-wgvp-vg3v-2xq3","references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27025"},{"url":"https://github.com/py-pdf/pypdf/pull/3646"},{"url":"https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2"},{"url":"https://github.com/py-pdf/pypdf"},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.7.1"}],"tags":["osv","pip"],"epss":0.00184,"epssPercentile":0.07056,"ingestedAt":"2026-07-13T18:58:04.541Z","slug":"CVE-2026-27025","body":"## Overview\n\n### Impact\n\nAn 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.\n\n### Patches\n\nThis has been fixed in [pypdf==6.7.1](https://github.com/py-pdf/pypdf/releases/tag/6.7.1).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#3646](https://github.com/py-pdf/pypdf/pull/3646).\n\n## Affected packages\n\n- `pypdf < 6.7.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `pypdf 6.7.1`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}