CVE-2026-12490

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{"bugzilla": {"description": "nsd: Bypass of client certificate verification with transfer over TLS", "id": "2491590", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491590"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-303", "details": ["When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.", "A flaw was found in nsd. When a 'provide-xfr' is configured with a 'tls-auth-name', the server incorrectly allows zone transfers without requiring a client certificate if the request comes over TLS on the regular 'tls-port' or over TCP on the regular port, provided other access control conditions are met. This authentication bypass allows an attacker to perform unauthorized zone transfers, leading to information disclosure."], "name": "CVE-2026-12490", "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-12490\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-12490"], "statement": "This flaw is rated as Moderate. The nsd DNS server, when configured for zone transfers with `provide-xfr` and `tls-auth-name`, can bypass client certificate verification. This allows unauthorized zone transfers and information disclosure if requests are made over the regular TLS or TCP port, as the `tls-auth-xfr-only` option is not enabled by default.\nThis vulnerability doesn't affect any supported Red Hat Product.", "threat_severity": "Moderate"}

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