CVE Explorer
CVE-2026-34743
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"xz","vendor":"tukaani-project","versions":[{"status":"affected","version":"< 5.8.3"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:9313059e3b5fd2c1d9bff63c94ac3adf4db3122b8dbd01bc92ea7e41a713d5e9 · sha256:78942c62a1e58485… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":1.7,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:9313059e3b5fd2c1d9bff63c94ac3adf4db3122b8dbd01bc92ea7e41a713d5e9 · sha256:78942c62a1e58485… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:9313059e3b5fd2c1d9bff63c94ac3adf4db3122b8dbd01bc92ea7e41a713d5e9 · sha256:78942c62a1e58485… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"url":"http://www.openwall.com/lists/oss-security/2026/03/31/13"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9313059e3b5fd2c1d9bff63c94ac3adf4db3122b8dbd01bc92ea7e41a713d5e9 · sha256:78942c62a1e58485… · /containers/adp/0/references/0
{"name":"https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87","tags":["x_refsource_MISC"],"url":"https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9313059e3b5fd2c1d9bff63c94ac3adf4db3122b8dbd01bc92ea7e41a713d5e9 · sha256:78942c62a1e58485… · /containers/cna/references/1
{"name":"https://github.com/tukaani-project/xz/releases/tag/v5.8.3","tags":["x_refsource_MISC"],"url":"https://github.com/tukaani-project/xz/releases/tag/v5.8.3"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9313059e3b5fd2c1d9bff63c94ac3adf4db3122b8dbd01bc92ea7e41a713d5e9 · sha256:78942c62a1e58485… · /containers/cna/references/2
{"name":"https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9313059e3b5fd2c1d9bff63c94ac3adf4db3122b8dbd01bc92ea7e41a713d5e9 · sha256:78942c62a1e58485… · /containers/cna/references/0
{"url":"https://lists.debian.org/debian-lts-announce/2026/07/msg00034.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9313059e3b5fd2c1d9bff63c94ac3adf4db3122b8dbd01bc92ea7e41a713d5e9 · sha256:78942c62a1e58485… · /containers/adp/0/references/1
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.