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is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can consume excessive memory while parsing a crafted PDF page tree containing many shared resources. Page-tree flattening copies page dictionary and inherited resource entries without a document-wide entry budget, allowing the crafted resource structure to cause disproportionate allocations. This issue is fixed in version 6.21.4.","epss":{"date":"2026-11-03","percentile":0.12698,"score":0.00221},"exploits":[],"kev":null,"metrics":[{"score":7.1,"severity":"high","source":"CNA: GitHub_M","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.1,"severity":"high","source":"NVD: security-advisories@github.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":5.5,"severity":"medium","source":"NVD: nvd@nist.gov","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793756541589,"publishedAt":1793306042704,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-cggf-277g-3q54"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/pull/4290"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/commit/ea4ac663133f1b3de1d7a8f2e6fa239802fde79e"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.4"},{"source":"security-advisories@github.com","tags":["Patch"],"url":"https://github.com/py-pdf/pypdf/commit/ea4ac663133f1b3de1d7a8f2e6fa239802fde79e"},{"source":"security-advisories@github.com","tags":["Patch"],"url":"https://github.com/py-pdf/pypdf/pull/4290"},{"source":"security-advisories@github.com","tags":["Release Notes"],"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.4"},{"source":"security-advisories@github.com","tags":["Patch","Vendor Advisory"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-cggf-277g-3q54"},{"source":"GitHub Security Advisories","tags":["advisory"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-cggf-277g-3q54"},{"source":"OSV / GitHub Security Advisories","tags":["advisory"],"url":"https://github.com/advisories/GHSA-cggf-277g-3q54"},{"source":"OSV / GitHub Security Advisories","tags":["osv"],"url":"https://osv.dev/vulnerability/GHSA-cggf-277g-3q54"}],"remediation":[{"kind":"fix","source":"security-advisories@github.com","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/py-pdf/pypdf/commit/ea4ac663133f1b3de1d7a8f2e6fa239802fde79e"},{"kind":"fix","source":"security-advisories@github.com","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/py-pdf/pypdf/pull/4290"},{"kind":"fix","source":"security-advisories@github.com","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-cggf-277g-3q54"},{"kind":"fix","source":"GitHub GHSA-cggf-277g-3q54","text":"pypi (pip): GitHub reports patched versions >= 6.21.4. Check the advisory for the affected release branch.","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-cggf-277g-3q54"},{"kind":"fix","source":"OSV GHSA-cggf-277g-3q54","text":"pypdf (PyPI): OSV reports a fixed version 6.21.4. Check the advisory for supported release branches.","url":"https://github.com/advisories/GHSA-cggf-277g-3q54"}],"revision":"1835652b341d92349c01af327eb19afd2b74d8cb155539aaf0b321cbbb8473d2","sources":[{"modifiedAt":1793756541589,"name":"CNA: GitHub_M","retrievedAt":1793758144560,"url":"https://www.cve.org/CVERecord?id=CVE-2026-119204"},{"modifiedAt":1793635564477,"name":"NVD","retrievedAt":1793643470653,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119204"},{"modifiedAt":1793305873000,"name":"GitHub Security Advisories","retrievedAt":1793758509619,"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-cggf-277g-3q54"},{"modifiedAt":1793403004096,"name":"OSV / GitHub Security Advisories","retrievedAt":1793643471139,"url":"https://osv.dev/vulnerability/GHSA-cggf-277g-3q54"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793758171070,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-119204"}],"ssvc":{"assessedAt":1793756531010,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"pypdf: Possible large memory usage when parsing page tree","updatedAt":1793758509619}