{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-02T18:36:37Z",
  "bugzilla" : {
    "description" : "xz: XZ Utils: Denial of Service via buffer overflow in index decoding",
    "id" : "2454589",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2454589"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.3",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
    "status" : "verified"
  },
  "cwe" : "CWE-131",
  "details" : [ "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.", "A flaw was found in XZ Utils. When the `lzma_index_decoder()` function processes an empty index, and a subsequent `lzma_index_append()` operation is performed, insufficient memory is allocated. This can lead to a buffer overflow, potentially causing a denial of service (DoS) for affected systems." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-04-11T00:00:00Z",
    "advisory" : "RHSA-2026:7647",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "xz-main-5.8.3-1.1.hum1"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "xz",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "xz",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "xz",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "xz",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "xz",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Fix deferred",
    "package_name" : "rhcos",
    "cpe" : "cpe:/a:redhat:openshift:4"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-34743\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34743\nhttps://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87\nhttps://github.com/tukaani-project/xz/releases/tag/v5.8.3\nhttps://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv" ],
  "name" : "CVE-2026-34743",
  "csaw" : false
}