{"id":"CVE-2026-28804","aliases":["GHSA-9m86-7pmv-2852","PYSEC-2026-3014"],"url":"https://o3.security/vulnerability/CVE-2026-28804","summary":"pypdf: Inefficient decoding of ASCIIHexDecode streams","details":"### Impact\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the `/ASCIIHexDecode` filter.\n\n### Patches\nThis has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).","published":"2026-03-06T06:46:28.890Z","modified":"2026-08-27T14:10:51.951379842Z","cvss":null,"epss":{"score":0.00399,"percentile":0.33701,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.7.5"}],"fix":{"url":"https://github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f","label":"py-pdf/pypdf@648c627"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.7.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28804.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-9m86-7pmv-2852"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28804"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/3666"},{"type":"PACKAGE","url":"https://github.com/py-pdf/pypdf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T14:10:51.951379842Z"}}