{"id":"CVE-2026-63273","state":"PUBLISHED","title":"Heap buffer overflow in PDF import encryption handling","description":"LibreOffice Draw can import PDF documents. A heap buffer overflow existed when importing an encrypted document. The length of the decryption key was taken from the document's own encryption dictionary and was used to fill a fixed size key buffer without being checked against it, so a length larger than that buffer wrote past its end. In fixed versions a declared key length larger than the buffer is rejected.","publishedAt":"2026-09-22T11:10:13.896Z","updatedAt":"2026-09-28T14:23:01.725Z","severity":{"score":5.4,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P","source":"Document Fdn."},"assigner":"Document Fdn.","products":["The Document Foundation LibreOffice"],"affected":[{"vendor":"The Document Foundation","product":"LibreOffice","defaultStatus":"unknown","versions":[{"version":"26.2","status":"affected","lessThan":"< 26.2.5","versionType":"26.2 series"}]}],"references":["https://www.libreoffice.org/about-us/security/advisories/cve-2026-63273"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63273.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63273","state":"PUBLISHED","datePublished":"2026-09-22T11:10:13.896Z","dateUpdated":"2026-09-28T14:23:01.725Z","assignerShortName":"Document Fdn.","assignerOrgId":"4fe7d05b-1353-44cc-8b7a-1e416936dff2","dateReserved":"2026-07-16T08:17:05.512Z"},"containers":{"cna":{"title":"Heap buffer overflow in PDF import encryption handling","descriptions":[{"lang":"en","value":"LibreOffice Draw can import PDF documents. A heap buffer overflow existed when importing an encrypted document. The length of the decryption key was taken from the document's own encryption dictionary and was used to fill a fixed size key buffer without being checked against it, so a length larger than that buffer wrote past its end. In fixed versions a declared key length larger than the buffer is rejected."}],"affected":[{"vendor":"The Document Foundation","product":"LibreOffice","defaultStatus":"unknown","versions":[{"version":"26.2","status":"affected","lessThan":"< 26.2.5","versionType":"26.2 series"}]}],"references":[{"url":"https://www.libreoffice.org/about-us/security/advisories/cve-2026-63273"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"PROOF_OF_CONCEPT","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":5.4,"vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787 Out-of-bounds Write","type":"CWE"}]}],"providerMetadata":{"shortName":"Document Fdn.","orgId":"4fe7d05b-1353-44cc-8b7a-1e416936dff2","dateUpdated":"2026-09-28T14:23:01.725Z"},"datePublic":"2026-09-21T23:59:00.000Z","credits":[{"lang":"en","type":"finder","value":"Claude, found by Anthropic using agents to study the security of open-source projects"},{"lang":"en","type":"analyst","value":"Ada Logics, validating and reporting"},{"lang":"en","type":"finder","value":"Anonymous working with TrendAI Zero Day Initiative"},{"lang":"en","type":"remediation developer","value":"Caolán McNamara of Collabora Productivity"}],"impacts":[{"capecId":"CAPEC-44","descriptions":[{"lang":"en","value":"CAPEC-44 Overflow Binary Resource File"}]}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T12:27:28.185839Z","id":"CVE-2026-63273","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":"2026-09-22T12:27:46.334Z"}}]}}}