{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-12T21:40:19Z",
  "bugzilla" : {
    "description" : "mod_security: ModSecurity: Denial of Service via unsigned integer underflow in rule verification functions",
    "id" : "2476872",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2476872"
  },
  "cvss3" : {
    "cvss3_base_score" : "4.9",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-191",
  "details" : [ "A flaw was found in ModSecurity, an open-source web application firewall (WAF). This vulnerability occurs when an administrator configures a rule that uses `@verifySSN`, `@verifyCPF`, or `@verifySVNR` functions. An unhandled exception, specifically an unsigned integer underflow, can lead to a denial of service (DoS) condition, making the WAF unavailable." ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "mod_security",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "mod_security",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-42268\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42268\nhttps://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-vwr3-7x7g-7p9w" ],
  "name" : "CVE-2026-42268",
  "mitigation" : {
    "value" : "To mitigate this issue, administrators should avoid configuring ModSecurity rules that utilize the `@verifySSN`, `@verifyCPF`, or `@verifySVNR` functions. Disabling or removing these specific rules will prevent the unsigned integer underflow that leads to a denial of service. After modifying ModSecurity configuration, a service reload or restart may be required for the changes to take effect.",
    "lang" : "en:us"
  },
  "csaw" : false
}