{"id":"CVE-2026-119209","published":"2026-10-29T21:17:20.230","lastModified":"2026-10-29T21:17:20.230","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries across a document, while negative /Index counts can bypass the existing per-stream clamp. This issue is fixed in version 6.21.3.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-400","CWE-770"],"vendors":[],"products":[],"references":[{"url":"https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4","tags":[]},{"url":"https://github.com/py-pdf/pypdf/pull/4269","tags":[]},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.3","tags":[]},{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc","tags":[]}],"exploitRefs":[{"url":"https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4","tags":[]},{"url":"https://github.com/py-pdf/pypdf/pull/4269","tags":[]},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.3","tags":[]},{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc","tags":[]}],"hasPoc":true,"ai":null}