CVE-2026-73637

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{"affected_release": [{"advisory": "RHSA-2026:74858", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "httpd-main-2.4.69-1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-10-02T00:00:00Z"}], "bugzilla": {"description": "httpd: httpd: Authentication state corruption via concurrent Digest authentication requests", "id": "2544814", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544814"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L", "status": "verified"}, "cwe": "CWE-825", "details": ["A flaw was found in httpd's mod_auth_digest module. A use-after-free vulnerability allows an unauthenticated remote attacker to corrupt the server's authentication state by submitting concurrent Digest authentication requests. This issue occurs when specific configuration settings, such as nonce checking (AuthDigestNcCheck) or zero-duration nonce lifetimes (AuthDigestNonceLifetime), are enabled."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, apply one of the following configuration options:\n1. Disable `mod_auth_digest` if Digest authentication is not required:\nIn `/etc/httpd/conf.modules.d/00-base.conf` (or the relevant module configuration file), comment out the loading of the module:\n```\n# LoadModule auth_digest_module modules/mod_auth_digest.so\n```\n2. If Digest authentication is required, ensure vulnerable settings are disabled:\nEnsure `AuthDigestNcCheck` is set to `Off` (or removed, as `Off` is the default) and ensure `AuthDigestNonceLifetime` is not set to `0` (the default value is 300 seconds).\nAfter applying configuration adjustments, reload the web server:\n```\nsystemctl reload httpd\n```\nWarning: Reloading or restarting the `httpd` service may briefly disrupt active client connections. Disabling `mod_auth_digest` will cause authentication failures for resources configured with `AuthType Digest`."}, "name": "CVE-2026-73637", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "httpd:2.4/httpd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-10-01T16:18:30Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-73637\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-73637\nhttp://www.openwall.com/lists/oss-security/2026/10/01/28\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "threat_severity": "Moderate"}

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