{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33246", "tracking": { "current_release_date": "2026-03-29T01:16:16.316206Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33246", "initial_release_date": "2026-03-24T23:11:52.184401Z", "revision_history": [ { "date": "2026-03-24T23:11:52.184401Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-24T23:12:02.335490Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-25T11:35:55.575643Z", "number": "3", "summary": "NCSC Score updated." }, { "date": "2026-03-25T13:15:14.731582Z", "number": "4", "summary": "Source connected.| CVE status created. (valid)| Products connected (2).| References created (13)." }, { "date": "2026-03-25T13:15:27.024206Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-25T18:12:48.863211Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| References created (2).| CWES updated (1)." }, { "date": "2026-03-25T18:12:50.733310Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-25T20:41:29.628788Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| References created (2).| CWES updated (1)." }, { "date": "2026-03-25T20:41:31.869028Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-25T20:53:19.483410Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-25T20:53:24.138270Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-26T00:29:06.433446Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Identifiers created (2).| Product Remediations created (4).| References created (4).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-26T00:29:14.150639Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-26T12:44:27.774605Z", "number": "14", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-03-26T15:02:15.322039Z", "number": "15", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-26T15:02:17.221258Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-03-26T17:27:59.254336Z", "number": "17", "summary": "Products connected (2).| Product Identifiers created (2)." }, { "date": "2026-03-26T17:28:01.743381Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-03-27T00:13:46.757151Z", "number": "19", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (2)." }, { "date": "2026-03-27T00:13:48.967579Z", "number": "20", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:42:00.309530Z", "number": "21", "summary": "Unknown change." }, { "date": "2026-03-28T07:42:03.000704Z", "number": "22", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:57:39.719181Z", "number": "23", "summary": "References created (1)." }, { "date": "2026-03-28T08:10:33.693690Z", "number": "24", "summary": "References removed (1)." }, { "date": "2026-03-29T01:16:09.156566Z", "number": "25", "summary": "References created (1)." } ], "status": "interim", "version": "25" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2552008", "product_identification_helper": { "cpe": "cpe:/a:redhat:multicluster_globalhub" } } } ], "category": "product_name", "name": "Multicluster Global Hub" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/4", "product": { "name": "vers:rpm/4", "product_id": "CSAFPID-1439328", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift:4" } } } ], "category": "product_name", "name": "Red Hat OpenShift Container Platform 4" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2914734" } } ], "category": "product_name", "name": "multicluster-globalhub-grafana-rhel9" } ], "category": "product_family", "name": "Multicluster Global Hub" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2257522" } } ], "category": "product_name", "name": "oc-mirror-plugin-rhel9" } ], "category": "product_family", "name": "Red Hat OpenShift Container Platform 4" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<2.11.15", "product": { "name": "vers:unknown/<2.11.15", "product_id": "CSAFPID-5906252" } }, { "category": "product_version_range", "name": "vers:unknown/<2.12.6", "product": { "name": "vers:unknown/<2.12.6", "product_id": "CSAFPID-5906253" } } ], "category": "product_name", "name": "NATS Server" } ], "category": "vendor", "name": "Open Source" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<2.11.15", "product": { "name": "vers:unknown/<2.11.15", "product_id": "CSAFPID-5903111" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<2.11.15", "product": { "name": "vers:unknown/>=0|<2.11.15", "product_id": "CSAFPID-5907189" } }, { "category": "product_version_range", "name": "vers:unknown/>=2.12.0-rc.1|<2.12.6", "product": { "name": "vers:unknown/>=2.12.0-rc.1|<2.12.6", "product_id": "CSAFPID-5903112" } } ], "category": "product_name", "name": "Nats Server" } ], "category": "vendor", "name": "Nats" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-2649998" } } ], "category": "product_name", "name": "nats-server" } ], "category": "product_family", "name": "bookworm" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<2.11.15", "product": { "name": "vers:unknown/<2.11.15", "product_id": "CSAFPID-5918227", "product_identification_helper": { "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=2.12.0|<2.12.6", "product": { "name": "vers:unknown/>=2.12.0|<2.12.6", "product_id": "CSAFPID-5918228", "product_identification_helper": { "cpe": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "nats-server" } ], "category": "vendor", "name": "linuxfoundation" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33246", "cwe": { "id": "CWE-290", "name": "Authentication Bypass by Spoofing" }, "notes": [ { "category": "description", "text": "### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nThe nats-server allows hub/spoke topologies using \"leafnode\" connections by other nats-servers. NATS messages can have headers.\n\n### Problem Description\n\nThe 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.\n\nA 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.\n\nThus NATS clients relying upon the Nats-Request-Info: header could be spoofed.\n\nDoes 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.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nNone.", "title": "github - https://api.github.com/advisories/GHSA-55h8-8g96-x4hj" }, { "category": "description", "text": "### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nThe nats-server allows hub/spoke topologies using \"leafnode\" connections by other nats-servers. NATS messages can have headers.\n\n### Problem Description\n\nThe 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.\n\nA 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.\n\nThus NATS clients relying upon the Nats-Request-Info: header could be spoofed.\n\nDoes 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.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nNone.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-55h8-8g96-x4hj.json?alt=media" }, { "category": "description", "text": "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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33246.json" }, { "category": "description", "text": "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.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33246" }, { "category": "description", "text": "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.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33246.json" }, { "category": "description", "text": "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.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33246" }, { "category": "description", "text": "NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers in github.com/nats-io/nats-server", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4830.json?alt=media" }, { "category": "other", "text": "0.00025", "title": "EPSS" }, { "category": "other", "text": "4.0", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is product data available from source Debian, Is related to a product by vendor Debian, The value of the most recent CVSS (V3) score, Is related to (a version of) an uncommon product, The value of the most recent EPSS score, Is related to an uncommon product vendor", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5906252", "CSAFPID-5906253", "CSAFPID-5903112", "CSAFPID-5907189", "CSAFPID-5903111", "CSAFPID-1439328", "CSAFPID-2257522", "CSAFPID-2552008", "CSAFPID-2914734", "CSAFPID-2649998", "CSAFPID-5918227", "CSAFPID-5918228" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-55h8-8g96-x4hj" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0858.json" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-55h8-8g96-x4hj.json?alt=media" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33246.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33246" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33246.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33246" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4830.json?alt=media" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; github; nvd; osv; redhat", "url": "https://advisories.nats.io/CVE/secnote-2026-08.txt" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-55h8-8g96-x4hj" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0858.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0858" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-05.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-06.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-07.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-09.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-10.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-11.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-12.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-13.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-14.txt" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://advisories.nats.io/CVE/secnote-2026-15.txt" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33246" }, { "category": "external", "summary": "Reference - github; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33246" } ], "remediations": [ { "category": "mitigation", "details": "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.", "product_ids": [ "CSAFPID-1439328", "CSAFPID-2257522", "CSAFPID-2552008", "CSAFPID-2914734" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.4, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1439328", "CSAFPID-2257522", "CSAFPID-2552008", "CSAFPID-2649998", "CSAFPID-2914734", "CSAFPID-5903111", "CSAFPID-5903112", "CSAFPID-5906252", "CSAFPID-5906253", "CSAFPID-5907189", "CSAFPID-5918227", "CSAFPID-5918228" ] } ], "title": "CVE-2026-33246" } ] }