{
  "threat_severity" : "Moderate",
  "public_date" : "2026-03-19T00:00:00Z",
  "bugzilla" : {
    "description" : "libarchive: libarchive: Denial of Service via malformed ISO file processing",
    "id" : "2449010",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2449010"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-1335",
  "details" : [ "A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.", "A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition." ],
  "statement" : "This MODERATE impact vulnerability in `libarchive`'s zisofs decompression logic can lead to a denial of service. The flaw is triggered when processing a specially crafted ISO9660 image containing an invalid shift exponent. Red Hat products that process untrusted ISO files using `libarchive` are susceptible to crashes.",
  "acknowledgement" : "Red Hat would like to thank Elhanan Haenel for reporting this issue.",
  "affected_release" : [ {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-04-20T00:00:00Z",
    "advisory" : "RHSA-2026:8944",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "libarchive-main-3.8.7-1.hum1"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "libarchive",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "libarchive",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "libarchive",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "libarchive",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "libarchive",
    "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-2026-4426\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4426\nhttps://github.com/libarchive/libarchive/pull/2897" ],
  "name" : "CVE-2026-4426",
  "mitigation" : {
    "value" : "To mitigate this issue, avoid processing untrusted ISO9660 images with `libarchive`. Restricting the sources of ISO files and ensuring they originate from trusted entities can prevent exploitation.",
    "lang" : "en:us"
  },
  "csaw" : false
}