{"id":"CVE-2026-119203","state":"PUBLISHED","title":"pypdf: Possible infinite loop when hitting EOF in standard xref table during trailer search","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4.","publishedAt":"2026-10-29T20:30:13.426Z","updatedAt":"2026-10-30T17:11:01.881Z","severity":{"score":7.1,"label":"High","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["py-pdf pypdf"],"affected":[{"vendor":"py-pdf","product":"pypdf","versions":[{"version":"< 6.21.4","status":"affected"}]}],"references":["https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5","https://github.com/py-pdf/pypdf/pull/4289","https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a","https://github.com/py-pdf/pypdf/releases/tag/6.21.4"],"weaknesses":["CWE-835"],"ingestedAt":"2026-10-30T17:18:06.571Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/119xxx/CVE-2026-119203.json","commit":"caca5991c38b96213066f41f1d69f02d92b92db0","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-119203","state":"PUBLISHED","datePublished":"2026-10-29T20:30:13.426Z","dateUpdated":"2026-10-30T17:11:01.881Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-29T16:04:48.729Z"},"containers":{"cna":{"title":"pypdf: Possible infinite loop when hitting EOF in standard xref table during trailer search","descriptions":[{"lang":"en","value":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4."}],"affected":[{"vendor":"py-pdf","product":"pypdf","versions":[{"version":"< 6.21.4","status":"affected"}]}],"references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5","name":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/py-pdf/pypdf/pull/4289","name":"https://github.com/py-pdf/pypdf/pull/4289","tags":["x_refsource_MISC"]},{"url":"https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a","name":"https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a","tags":["x_refsource_MISC"]},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.4","name":"https://github.com/py-pdf/pypdf/releases/tag/6.21.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-835","lang":"en","description":"CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-29T20:30:13.426Z"},"source":{"advisory":"GHSA-5849-834g-hvw5","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-30T17:10:48.181038Z","id":"CVE-2026-119203","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-30T17:11:01.881Z"}}]}}}