{"id":"CVE-2026-73637","title":"Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication reque…","summary":"Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication reque…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","cwe":["CWE-416","CWE-825"],"vendor":"apache","product":"http_server","affected":["http_server >= 2.4.0, < 2.4.69"],"patched":["http_server 2.4.69"],"published":"2026-10-01","updated":"2026-10-05","sourceUpdated":"2026-10-05T17:39:38.120","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73637","references":[{"url":"https://httpd.apache.org/security/vulnerabilities_24.html","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/10/01/28","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73637.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-73637"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2544814"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-73637"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73637"},{"url":"https://access.redhat.com/errata/RHSA-2026:74858"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00466,"epssPercentile":0.40175,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-01T19:42:16.346387Z"},"scores":{"nvd":7.3,"vendor":5.6},"ingestedAt":"2026-10-01T18:55:42.365Z","slug":"CVE-2026-73637","body":"## Overview\n\nUse after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0.\n\nUsers are recommended to upgrade to version 2.4.69, which fixes this issue.\n\n## Affected\n\n- `http_server >= 2.4.0, < 2.4.69`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `http_server 2.4.69`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73637.json)\n- **RHSA-2026:74858** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74858)","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":214655,"id":"CVE-2026-73637","ts":1790884796593,"field":"cvss","old":null,"new":"7.3"},{"seq":214654,"id":"CVE-2026-73637","ts":1790884796593,"field":"severity","old":"none","new":"high"}]}