{
"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-2026-29054",
"tracking": {
"current_release_date": "2026-03-25T18:15:11.427087Z",
"generator": {
"date": "2026-02-17T15:00:00Z",
"engine": {
"name": "V.E.L.M.A",
"version": "1.7"
}
},
"id": "CVE-2026-29054",
"initial_release_date": "2026-03-04T21:51:00.794455Z",
"revision_history": [
{
"date": "2026-03-04T21:51:00.794455Z",
"number": "1",
"summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)."
},
{
"date": "2026-03-04T21:51:08.569005Z",
"number": "2",
"summary": "NCSC Score created."
},
{
"date": "2026-03-05T00:12:50.670849Z",
"number": "3",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (2).| References created (3).| CWES updated (1)."
},
{
"date": "2026-03-05T00:12:56.668279Z",
"number": "4",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-05T18:39:15.374793Z",
"number": "5",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| References created (3).| CWES updated (1)."
},
{
"date": "2026-03-05T18:39:17.209161Z",
"number": "6",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-05T19:29:12.965215Z",
"number": "7",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)."
},
{
"date": "2026-03-05T19:29:19.259896Z",
"number": "8",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-05T22:48:56.226359Z",
"number": "9",
"summary": "References created (1)."
},
{
"date": "2026-03-06T00:12:39.753216Z",
"number": "10",
"summary": "References created (1)."
},
{
"date": "2026-03-06T00:27:48.376481Z",
"number": "11",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| Product Identifiers created (1).| Product Remediations created (2).| References created (5).| CWES updated (1).| Vendor_assessment created."
},
{
"date": "2026-03-06T00:27:58.512587Z",
"number": "12",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-06T14:52:24.970357Z",
"number": "13",
"summary": "Source created.| CVE status created. (valid)| EPSS created."
},
{
"date": "2026-03-06T14:52:31.219816Z",
"number": "14",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-06T16:25:09.027464Z",
"number": "15",
"summary": "Products connected (2).| Product Identifiers created (2)."
},
{
"date": "2026-03-06T16:25:11.620510Z",
"number": "16",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-06T16:39:15.771559Z",
"number": "17",
"summary": "Unknown change."
},
{
"date": "2026-03-20T09:35:48.984488Z",
"number": "18",
"summary": "Source connected.| CVE status created. (valid)| EPSS created."
},
{
"date": "2026-03-20T09:35:51.849064Z",
"number": "19",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-25T18:15:08.968313Z",
"number": "20",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (4)."
},
{
"date": "2026-03-25T18:15:11.099590Z",
"number": "21",
"summary": "NCSC Score updated."
}
],
"status": "interim",
"version": "21"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:rpm/3",
"product": {
"name": "vers:rpm/3",
"product_id": "CSAFPID-1441150",
"product_identification_helper": {
"cpe": "cpe:/a:redhat:openshift_devspaces:3:"
}
}
}
],
"category": "product_name",
"name": "Red Hat OpenShift Dev Spaces"
},
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:rpm/unknown",
"product": {
"name": "vers:rpm/unknown",
"product_id": "CSAFPID-2485335"
}
}
],
"category": "product_name",
"name": "traefik-rhel9"
}
],
"category": "product_family",
"name": "Red Hat OpenShift Dev Spaces"
}
],
"category": "vendor",
"name": "Red Hat"
},
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:unknown/>=2.11.9|<2.11.38",
"product": {
"name": "vers:unknown/>=2.11.9|<2.11.38",
"product_id": "CSAFPID-5759446",
"product_identification_helper": {
"cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version_range",
"name": "vers:unknown/>=3.1.3|<3.6.9",
"product": {
"name": "vers:unknown/>=3.1.3|<3.6.9",
"product_id": "CSAFPID-5759447",
"product_identification_helper": {
"cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*"
}
}
}
],
"category": "product_name",
"name": "Traefik"
}
],
"category": "vendor",
"name": "Traefik"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-29054",
"cwe": {
"id": "CWE-178",
"name": "Improper Handling of Case Sensitivity"
},
"notes": [
{
"category": "description",
"text": "## Impact\n\nThere is a potential vulnerability in Traefik managing the `Connection` header with `X-Forwarded` headers.\n\nWhen Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed `X-Forwarded` headers (such as `X-Real-Ip`, `X-Forwarded-Host`, `X-Forwarded-Port`, etc.) via the `Connection` header does not handle case sensitivity correctly. The `Connection` tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase `Connection` tokens (e.g. `Connection: x-real-ip`) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers.\n\nThis is a bypass of the fix for [CVE-2024-45410](https://github.com/traefik/traefik/security/advisories/GHSA-62c8-mh53-4cqv).\n\nDepending on the deployment, the impact may be higher if downstream services rely on these headers (such as `X-Real-Ip` or `X-Forwarded-*`) for authentication, authorization, routing, or scheme decisions.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.38\n- https://github.com/traefik/traefik/releases/tag/v3.6.9\n\n## Workarounds\n\nNo workaround available.\n\n## For more information\n\nIf there are any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n---\n\n\nOriginal Description
\n\nTraefik's XForwarded middleware (removeConnectionHeaders) tries to prevent clients from using the Connection header to strip trusted X-Forwarded-* headers, but the protection compares the Connection tokens case-sensitively while the deletion is case-insensitive.\n\nAs a result, a remote unauthenticated client can send a lowercase token like Connection: x-real-ip and still trigger deletion of traefik-managed X-Real-Ip (and similarly named headers in the managed list).\n\nThis can cause downstream routing, scheme, and header-based authn/authz decisions to be evaluated with missing trusted forwarding identity headers.\n\n### Severity\n\nCRITICAL\n\nRationale: the PoC demonstrates an end-to-end access control bypass pattern when a downstream service uses proxy-provided identity headers (for example, X-Real-Ip) for IP allowlists or trust decisions. A remote unauthenticated client can strip the traefik-managed identity header via a lowercase Connection token, causing the downstream service to evaluate the request without the expected header signal.\n\n### Relevant Links\n\n- Repository: https://github.com/traefik/traefik\n- Pinned commit: a4a91344edcdd6276c1b766ca19ee3f0e346480f\n- Callsite (pinned): https://github.com/traefik/traefik/blob/a4a91344edcdd6276c1b766ca19ee3f0e346480f/pkg/middlewares/forwardedheaders/forwarded_header.go#L225\n\n### Vulnerability Details\n\n#### Root Cause\n\nremoveConnectionHeaders uses a case-sensitive membership check for protected header names when inspecting Connection tokens, but it deletes headers via net/http which treats header names case-insensitively. A lowercase token bypasses the protection check and still triggers deletion.\n\n#### Attacker Control / Attack Path\n\nRemote unauthenticated HTTP client (untrusted IP) sends Connection: x-real-ip, and Traefik deletes the generated X-Real-Ip header.\n\n### Proof of Concept\n\nThe attached poc.zip contains a deterministic, make-based integration PoC with a canonical run and a negative control.\n\nCanonical (vulnerable):\n\n unzip poc.zip -d poc\n cd poc\n make test\n\nOutput contains:\n\n [CALLSITE_HIT]: pkg/middlewares/forwardedheaders/forwarded_header.go:225\n [PROOF_MARKER]: downstream_admin_bypass=1 x_real_ip_present=0\n\nControl (same env, no lowercase token):\n\n unzip poc.zip -d poc\n cd poc\n make test\n\nOutput contains:\n\n [CALLSITE_HIT]: pkg/middlewares/forwardedheaders/forwarded_header.go:225\n [NC_MARKER]: downstream_admin_bypass=0 x_real_ip_present=1\n\nExpected: Connection tokens are handled case-insensitively and protected identity headers (for example, X-Real-Ip and X-Forwarded-*) are not deleted due to client-supplied Connection options (regardless of token casing).\n\nActual: Lowercase Connection tokens bypass the protection check and still trigger deletion of traefik-managed identity headers (for example, X-Real-Ip).\n\n### Recommended Fix\n\n- Case-fold (or otherwise canonicalize) Connection header tokens before comparing them against protected header names.\n- Add a regression test covering lowercase tokens (for example, Connection: x-real-ip).\n\nFix accepted when: a request with Connection: x-real-ip does not cause deletion of traefik-managed X-Real-Ip, and a regression test covers this behavior.\n\n ",
"title": "github - https://github.com/advisories/GHSA-92mv-8f8w-wq52"
},
{
"category": "description",
"text": "## Impact\n\nThere is a potential vulnerability in Traefik managing the `Connection` header with `X-Forwarded` headers.\n\nWhen Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed `X-Forwarded` headers (such as `X-Real-Ip`, `X-Forwarded-Host`, `X-Forwarded-Port`, etc.) via the `Connection` header does not handle case sensitivity correctly. The `Connection` tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase `Connection` tokens (e.g. `Connection: x-real-ip`) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers.\n\nThis is a bypass of the fix for [CVE-2024-45410](https://github.com/traefik/traefik/security/advisories/GHSA-62c8-mh53-4cqv).\n\nDepending on the deployment, the impact may be higher if downstream services rely on these headers (such as `X-Real-Ip` or `X-Forwarded-*`) for authentication, authorization, routing, or scheme decisions.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.38\n- https://github.com/traefik/traefik/releases/tag/v3.6.9\n\n## Workarounds\n\nNo workaround available.\n\n## For more information\n\nIf there are any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n---\n\n\nOriginal Description
\n\nTraefik's XForwarded middleware (removeConnectionHeaders) tries to prevent clients from using the Connection header to strip trusted X-Forwarded-* headers, but the protection compares the Connection tokens case-sensitively while the deletion is case-insensitive.\n\nAs a result, a remote unauthenticated client can send a lowercase token like Connection: x-real-ip and still trigger deletion of traefik-managed X-Real-Ip (and similarly named headers in the managed list).\n\nThis can cause downstream routing, scheme, and header-based authn/authz decisions to be evaluated with missing trusted forwarding identity headers.\n\n### Severity\n\nCRITICAL\n\nRationale: the PoC demonstrates an end-to-end access control bypass pattern when a downstream service uses proxy-provided identity headers (for example, X-Real-Ip) for IP allowlists or trust decisions. A remote unauthenticated client can strip the traefik-managed identity header via a lowercase Connection token, causing the downstream service to evaluate the request without the expected header signal.\n\n### Relevant Links\n\n- Repository: https://github.com/traefik/traefik\n- Pinned commit: a4a91344edcdd6276c1b766ca19ee3f0e346480f\n- Callsite (pinned): https://github.com/traefik/traefik/blob/a4a91344edcdd6276c1b766ca19ee3f0e346480f/pkg/middlewares/forwardedheaders/forwarded_header.go#L225\n\n### Vulnerability Details\n\n#### Root Cause\n\nremoveConnectionHeaders uses a case-sensitive membership check for protected header names when inspecting Connection tokens, but it deletes headers via net/http which treats header names case-insensitively. A lowercase token bypasses the protection check and still triggers deletion.\n\n#### Attacker Control / Attack Path\n\nRemote unauthenticated HTTP client (untrusted IP) sends Connection: x-real-ip, and Traefik deletes the generated X-Real-Ip header.\n\n### Proof of Concept\n\nThe attached poc.zip contains a deterministic, make-based integration PoC with a canonical run and a negative control.\n\nCanonical (vulnerable):\n\n unzip poc.zip -d poc\n cd poc\n make test\n\nOutput contains:\n\n [CALLSITE_HIT]: pkg/middlewares/forwardedheaders/forwarded_header.go:225\n [PROOF_MARKER]: downstream_admin_bypass=1 x_real_ip_present=0\n\nControl (same env, no lowercase token):\n\n unzip poc.zip -d poc\n cd poc\n make test\n\nOutput contains:\n\n [CALLSITE_HIT]: pkg/middlewares/forwardedheaders/forwarded_header.go:225\n [NC_MARKER]: downstream_admin_bypass=0 x_real_ip_present=1\n\nExpected: Connection tokens are handled case-insensitively and protected identity headers (for example, X-Real-Ip and X-Forwarded-*) are not deleted due to client-supplied Connection options (regardless of token casing).\n\nActual: Lowercase Connection tokens bypass the protection check and still trigger deletion of traefik-managed identity headers (for example, X-Real-Ip).\n\n### Recommended Fix\n\n- Case-fold (or otherwise canonicalize) Connection header tokens before comparing them against protected header names.\n- Add a regression test covering lowercase tokens (for example, Connection: x-real-ip).\n\nFix accepted when: a request with Connection: x-real-ip does not cause deletion of traefik-managed X-Real-Ip, and a regression test covers this behavior.\n\n ",
"title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-92mv-8f8w-wq52.json?alt=media"
},
{
"category": "description",
"text": "Traefik is an HTTP reverse proxy and load balancer. From version 2.11.9 to 2.11.37 and from version 3.1.3 to 3.6.8, there is a potential vulnerability in Traefik managing the Connection header with X-Forwarded headers. When Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed X-Forwarded headers (such as X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) via the Connection header does not handle case sensitivity correctly. The Connection tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase Connection tokens (e.g. Connection: x-real-ip) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers. This issue has been patched in versions 2.11.38 and 3.6.9.",
"title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-29054"
},
{
"category": "description",
"text": "Traefik is an HTTP reverse proxy and load balancer. From version 2.11.9 to 2.11.37 and from version 3.1.3 to 3.6.8, there is a potential vulnerability in Traefik managing the Connection header with X-Forwarded headers. When Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed X-Forwarded headers (such as X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) via the Connection header does not handle case sensitivity correctly. The Connection tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase Connection tokens (e.g. Connection: x-real-ip) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers. This issue has been patched in versions 2.11.38 and 3.6.9.",
"title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-29054"
},
{
"category": "description",
"text": "No description is available for this CVE.",
"title": "redhat - https://access.redhat.com/security/cve/CVE-2026-29054"
},
{
"category": "description",
"text": "traefik CVE-2024-45410 fix bypass: lowercase `Connection` tokens can delete traefik-managed forwarded identity headers (for example, `X-Real-Ip`) in github.com/traefik/traefik",
"title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4597.json?alt=media"
},
{
"category": "other",
"text": "0.00013",
"title": "EPSS"
},
{
"category": "other",
"text": "4.3",
"title": "NCSC Score"
},
{
"category": "other",
"text": "The value of the most recent EPSS score, There is product_remediation data available from source Redhat",
"title": "NCSC Score top decreasing factors"
},
{
"category": "details",
"text": "Severity: 3\n",
"title": "Vendor assessment"
}
],
"product_status": {
"known_affected": [
"CSAFPID-5759446",
"CSAFPID-5759447",
"CSAFPID-1441150",
"CSAFPID-2485335"
]
},
"references": [
{
"category": "external",
"summary": "Source - github",
"url": "https://github.com/advisories/GHSA-92mv-8f8w-wq52"
},
{
"category": "external",
"summary": "Source raw - github",
"url": "https://api.github.com/advisories/GHSA-92mv-8f8w-wq52"
},
{
"category": "external",
"summary": "Source - osv",
"url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-92mv-8f8w-wq52.json?alt=media"
},
{
"category": "external",
"summary": "Source - cveprojectv5",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-29054"
},
{
"category": "external",
"summary": "Source raw - cveprojectv5",
"url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/29xxx/CVE-2026-29054.json"
},
{
"category": "external",
"summary": "Source - nvd",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29054"
},
{
"category": "external",
"summary": "Source raw - nvd",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-29054"
},
{
"category": "external",
"summary": "Source - redhat",
"url": "https://access.redhat.com/security/cve/CVE-2026-29054"
},
{
"category": "external",
"summary": "Source raw - redhat",
"url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-29054.json"
},
{
"category": "external",
"summary": "Source - first",
"url": "https://api.first.org/data/v1/epss?cve=CVE-2026-29054"
},
{
"category": "external",
"summary": "Source raw - first",
"url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
},
{
"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-2026-4597.json?alt=media"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; github; nvd; osv; redhat",
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-92mv-8f8w-wq52"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; github; nvd; osv; redhat",
"url": "https://github.com/traefik/traefik/releases/tag/v2.11.38"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; github; nvd; osv; redhat",
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.9"
},
{
"category": "external",
"summary": "Reference - github",
"url": "https://github.com/advisories/GHSA-92mv-8f8w-wq52"
},
{
"category": "external",
"summary": "Reference - github; osv; redhat",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29054"
},
{
"category": "external",
"summary": "Reference - redhat",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-29054"
}
],
"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-1441150",
"CSAFPID-2485335"
]
}
],
"scores": [
{
"cvss_v3": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"baseScore": 7.5,
"baseSeverity": "HIGH"
},
"products": [
"CSAFPID-1441150",
"CSAFPID-2485335",
"CSAFPID-5759446",
"CSAFPID-5759447"
]
}
],
"title": "CVE-2026-29054"
}
]
}