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is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. This issue is fixed in version 6.21.3.","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":1793726285060,"publishedAt":1793306235057,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/pull/4251"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.3"},{"source":"security-advisories@github.com","tags":["Patch"],"url":"https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e"},{"source":"security-advisories@github.com","tags":["Patch"],"url":"https://github.com/py-pdf/pypdf/pull/4251"},{"source":"security-advisories@github.com","tags":["Release Notes"],"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.3"},{"source":"security-advisories@github.com","tags":["Patch","Vendor Advisory"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw"},{"source":"GitHub Security Advisories","tags":["advisory"],"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw"},{"source":"OSV / GitHub Security Advisories","tags":["advisory"],"url":"https://github.com/advisories/GHSA-42gh-23hr-vphw"},{"source":"OSV / GitHub Security Advisories","tags":["osv"],"url":"https://osv.dev/vulnerability/GHSA-42gh-23hr-vphw"}],"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/b891fef37000cd86baa6e9848a3387d080b3b03e"},{"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/4251"},{"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-42gh-23hr-vphw"},{"kind":"fix","source":"GitHub GHSA-42gh-23hr-vphw","text":"pypdf (pip): GitHub reports patched versions >= 6.21.3. Check the advisory for the affected release branch.","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw"},{"kind":"fix","source":"OSV GHSA-42gh-23hr-vphw","text":"pypdf (PyPI): OSV reports a fixed version 6.21.3. Check the advisory for supported release branches.","url":"https://github.com/advisories/GHSA-42gh-23hr-vphw"}],"revision":"2edfbae49d07417e1e0bc8fd8bf6598bef04af33dc8bfc7967359ad00016a9b9","sources":[{"modifiedAt":1793724107790,"name":"CNA: GitHub_M","retrievedAt":1793725844293,"url":"https://www.cve.org/CVERecord?id=CVE-2026-119206"},{"modifiedAt":1793726285060,"name":"NVD","retrievedAt":1793729942531,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119206"},{"modifiedAt":1793306189000,"name":"GitHub Security Advisories","retrievedAt":1793726110197,"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw"},{"modifiedAt":1793402105410,"name":"OSV / GitHub Security Advisories","retrievedAt":1793643471715,"url":"https://osv.dev/vulnerability/GHSA-42gh-23hr-vphw"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793725881826,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-119206"}],"ssvc":{"assessedAt":1793724064264,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"pypdf: Possible long runtimes when retrieving page labels","updatedAt":1793729942531}