CVE-2026-34743 (GCVE-0-2026-34743)
Vulnerability from cvelistv5
Published
2026-04-02 18:36
Modified
2026-04-03 12:59
Severity ?
1.7 (Low) - 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
CWE
  • CWE-122 - Heap-based Buffer Overflow
Summary
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.
References
Impacted products
Vendor Product Version
tukaani-project xz Version: < 5.8.3
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        "metrics": [
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                "id": "CVE-2026-34743",
                "options": [
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                    "Exploitation": "none"
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          "versions": [
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      "metrics": [
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            "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",
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
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      "references": [
        {
          "name": "https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv",
          "tags": [
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      "title": "XZ Utils: Buffer overflow in lzma_index_append()"
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    "datePublished": "2026-04-02T18:36:37.450Z",
    "dateReserved": "2026-03-30T19:17:10.224Z",
    "dateUpdated": "2026-04-03T12:59:06.096Z",
    "state": "PUBLISHED"
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