{"id":"CVE-2026-34743","state":"PUBLISHED","title":"XZ Utils: Buffer overflow in lzma_index_append()","description":"XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.","publishedAt":"2026-04-02T18:36:37.450Z","updatedAt":"2026-07-21T22:19:21.175Z","severity":{"score":1.7,"label":"Low","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","source":"GitHub_M"},"assigner":"GitHub_M","products":["tukaani-project xz"],"affected":[{"vendor":"tukaani-project","product":"xz","versions":[{"version":"< 5.8.3","status":"affected"}]}],"references":["https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv","https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87","https://github.com/tukaani-project/xz/releases/tag/v5.8.3","http://www.openwall.com/lists/oss-security/2026/03/31/13","https://lists.debian.org/debian-lts-announce/2026/07/msg00034.html"],"weaknesses":["CWE-122"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/34xxx/CVE-2026-34743.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-34743","state":"PUBLISHED","datePublished":"2026-04-02T18:36:37.450Z","dateUpdated":"2026-07-21T22:19:21.175Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-30T19:17:10.224Z"},"containers":{"cna":{"title":"XZ Utils: Buffer overflow in lzma_index_append()","descriptions":[{"lang":"en","value":"XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3."}],"affected":[{"vendor":"tukaani-project","product":"xz","versions":[{"version":"< 5.8.3","status":"affected"}]}],"references":[{"url":"https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv","name":"https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87","name":"https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87","tags":["x_refsource_MISC"]},{"url":"https://github.com/tukaani-project/xz/releases/tag/v5.8.3","name":"https://github.com/tukaani-project/xz/releases/tag/v5.8.3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":1.7,"baseSeverity":"LOW","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"CWE-122: Heap-based Buffer Overflow","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-02T18:36:37.450Z"},"source":{"advisory":"GHSA-x872-m794-cxhv","discovery":"UNKNOWN"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/03/31/13"},{"url":"https://lists.debian.org/debian-lts-announce/2026/07/msg00034.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-21T22:19:21.175Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-03T12:58:58.398176Z","id":"CVE-2026-34743","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-03T12:59:06.096Z"}}]}}}