CVE-2026-58251

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{"affected": [{"affectedData": [{"product": "nats-server", "vendor": "nats-io", "versions": [{"status": "affected", "version": "< 2.11.16"}, {"status": "affected", "version": ">= 2.12.0-RC.1, < 2.12.7"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*", "matchCriteriaId": "64D69F6E-293C-4D5F-92F6-8479213F7727", "versionEndExcluding": "2.11.16", "vulnerable": true}, {"criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*", "matchCriteriaId": "DEE2D11B-BD56-4479-A5EB-79F352DA68AB", "versionEndExcluding": "2.12.7", "versionStartIncluding": "2.12.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "NATS Server es un servidor de alto rendimiento para NATS.io, el sistema de mensajer\u00eda nativo de la nube y del borde. Antes de las versiones 2.14.0, 2.12.7 y 2.11.16, un usuario autenticado con permisos de denegaci\u00f3n de suscripci\u00f3n pod\u00eda eludir una regla de denegaci\u00f3n de asunto simple al usar una suscripci\u00f3n de cola, porque la evaluaci\u00f3n de denegaci\u00f3n espec\u00edfica de la cola pod\u00eda anular el resultado de denegaci\u00f3n de asunto simple cuando el nombre de la cola en s\u00ed no estaba denegado. Este problema est\u00e1 solucionado en las versiones 2.14.0, 2.12.7 y 2.11.16."}], "id": "CVE-2026-58251", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-58251", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-09T13:40:09.306056Z", "version": "2.0.3"}}]}, "published": "2026-07-08T20:16:54.630", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/nats-io/nats-server/commit/013586288078def45a6788096924eb4d150db65c"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/nats-io/nats-server/commit/79c2f6e9ff87f594596337b6427dda85c38d1fe1"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/nats-io/nats-server/commit/b9ffb63b85e7db3d25a13b2e234f5f7f7c13164d"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/nats-io/nats-server/releases/tag/v2.11.16"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/nats-io/nats-server/releases/tag/v2.12.7"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/nats-io/nats-server/releases/tag/v2.14.0"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-jx8g-9g95-6322"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"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"}

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