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{"bugzilla": {"description": "github.com/nats-io/nats-server: NATS Server: Information disclosure due to bypass of subject deny rules via queue subscriptions", "id": "2498195", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498195"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-551", "details": ["NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.", "A flaw was found in NATS Server, a high-performance messaging system. An authenticated user with specific permissions could bypass security rules designed to deny access to certain message subjects. This bypass occurs when a queue subscription is used, allowing the user to access information that should otherwise be restricted. The consequence is unauthorized information disclosure, potentially exposing sensitive data."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-58251", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "nats-server2.12", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "nats-server2.14", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-08T19:40:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-58251\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-58251\nhttps://github.com/nats-io/nats-server/commit/013586288078def45a6788096924eb4d150db65c\nhttps://github.com/nats-io/nats-server/commit/79c2f6e9ff87f594596337b6427dda85c38d1fe1\nhttps://github.com/nats-io/nats-server/commit/b9ffb63b85e7db3d25a13b2e234f5f7f7c13164d\nhttps://github.com/nats-io/nats-server/releases/tag/v2.11.16\nhttps://github.com/nats-io/nats-server/releases/tag/v2.12.7\nhttps://github.com/nats-io/nats-server/releases/tag/v2.14.0\nhttps://github.com/nats-io/nats-server/security/advisories/GHSA-jx8g-9g95-6322"], "statement": "Moderate: An information disclosure flaw was found in NATS Server where an authenticated user with subscription deny permissions could bypass subject deny rules using a queue subscription. This could lead to unauthorized access to sensitive data.", "threat_severity": "Moderate"}