CVE-2026-73636

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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 bypass via credential replay in mod_auth_digest", "id": "2544849", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544849"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-294", "details": ["A flaw was found in the mod_auth_digest module of the Apache HTTP Server. This vulnerability allows an attacker positioned on the network to bypass authentication by replaying previously intercepted user credentials. When the server is configured with a nonce (a single-use security token) lifetime of zero, an attacker can send crafted requests that prematurely clear the client session entry from shared memory, enabling unauthorized access using the replayed credentials."], "mitigation": {"lang": "en:us", "value": "Ensure that `AuthDigestNonceLifetime` is not set to `0`. If digest authentication is not required, disable `mod_auth_digest`.\n1. To retain digest authentication with safe settings, set a positive non-zero value (such as the default 300 seconds) or remove the explicit zero setting from `/etc/httpd/conf/httpd.conf` or relevant files in `/etc/httpd/conf.d/`:\n```\nAuthDigestNonceLifetime 300\n```\n2. If HTTP digest authentication is not needed, disable the module by commenting out the corresponding line in `/etc/httpd/conf.modules.d/00-base.conf`:\n```\n#LoadModule auth_digest_module modules/mod_auth_digest.so\n```\n3. Restart the web server to apply changes:\n```\nsystemctl restart httpd\n```\nWarning: Restarting or reloading the httpd service will briefly disrupt active client connections. Disabling the module will break authentication for virtual hosts or directories relying on digest authentication."}, "name": "CVE-2026-73636", "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": "Affected", "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": "2026-10-01T16:17:59Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-73636\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-73636\nhttp://www.openwall.com/lists/oss-security/2026/10/01/27\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "threat_severity": "Important"}

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