{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33246", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-18T02:42:27.509Z", "datePublished": "2026-03-25T19:50:03.453Z", "dateUpdated": "2026-03-25T19:50:03.453Z"}, "containers": {"cna": {"title": "NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers", "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "lang": "en", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-290", "lang": "en", "description": "CWE-290: Authentication Bypass by Spoofing", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj"}, {"name": "https://advisories.nats.io/CVE/secnote-2026-08.txt", "tags": ["x_refsource_MISC"], "url": "https://advisories.nats.io/CVE/secnote-2026-08.txt"}], "affected": [{"vendor": "nats-io", "product": "nats-server", "versions": [{"version": "< 2.11.15", "status": "affected"}, {"version": ">= 2.12.0-RC.1, < 2.12.6", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-25T19:50:03.453Z"}, "descriptions": [{"lang": "en", "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available."}], "source": {"advisory": "GHSA-55h8-8g96-x4hj", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available."}], "id": "CVE-2026-33246", "lastModified": "2026-03-25T20:16:33.010", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-25T20:16:33.010", "references": [{"source": "security-advisories@github.com", "url": "https://advisories.nats.io/CVE/secnote-2026-08.txt"}, {"source": "security-advisories@github.com", "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}, {"lang": "en", "value": "CWE-290"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "nats-server: nats: github.com/nats-io/nats-server: NATS-Server: Client identity spoofing via Nats-Request-Info header manipulation", "id": "2451449", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451449"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-290", "details": ["A flaw was found in NATS-Server. A remote attacker, by connecting a leafnode to a NATS-Server, could propagate unchecked identity claims through the `Nats-Request-Info:` message header. This vulnerability allows for the spoofing of client identities, potentially leading to NATS clients making incorrect trust decisions based on misleading information. This could result in unauthorized information disclosure or integrity compromises within the messaging system."], "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-2026-33246", "package_state": [{"cpe": "cpe:/a:redhat:multicluster_globalhub", "fix_state": "Fix deferred", "package_name": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9", "product_name": "Multicluster Global Hub"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift4/oc-mirror-plugin-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-25T19:50:03Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33246\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33246\nhttps://advisories.nats.io/CVE/secnote-2026-08.txt\nhttps://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj"], "threat_severity": "Moderate"}

{}