{"id":"CVE-2026-62987","revision":null,"records":[{"revision":"f874e6656123485da2cd3dff952239fb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-62987","aliases":[],"title":"Fabio - Incomplete fix for CVE-2025-48865: operator-configured trust headers (clientip/tls/requestid) still strippable via the Connection header","description":"Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in proxy/http_headers.go uses protectHeaders for a hardcoded set of forwarded headers but omits the operator-configured ClientIPHeader, TLSHeader, and RequestID names. In proxy/http_proxy.go, HTTPProxy.ServeHTTP calls addHeaders to set these trust headers before Go ReverseProxy processes the inbound Connection header, allowing an unauthenticated client to name and remove the configured headers before the request reaches the backend. Deployments that enable the corresponding proxy.header options can therefore lose client-IP, TLS-termination, or request-correlation signals used by backend authorization and auditing; the options are empty by default, and the hardcoded protected forwarded headers are unaffected. This issue is fixed in version 1.7.2.","state":0,"publishedAt":"2026-09-21T16:11:21.044+00:00","modifiedAt":"2026-09-21T18:04:03.288+00:00","affected":[{"ecosystem":"Vendor product","name":"fabio","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"fabiolb\",\n                    \"product\": \"fabio\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.6.6, < 1.7.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","score":5.8,"severity":"MEDIUM"}],"references":["https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v","https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357","https://github.com/fabiolb/fabio/releases/tag/v1.7.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-62987","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-62987","identifiers":["CVE-2026-62987"]},"retained":false,"historicalAffected":[]},{"revision":"7fd909ea9fe149e18d2ee42d5135951c","observedAt":"2026-11-11T15:05:30.332+00:00","statement":{"source":"euvd","id":"EUVD-2026-83986","aliases":["CVE-2026-62987","GHSA-fq95-v8xc-jm3v"],"title":"Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in proxy/http_headers.go uses protectHeaders for a hardcoded set of forwarded headers but omits the operator-con…","description":"Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in proxy/http_headers.go uses protectHeaders for a hardcoded set of forwarded headers but omits the operator-configured ClientIPHeader, TLSHeader, and RequestID names. In proxy/http_proxy.go, HTTPProxy.ServeHTTP calls addHeaders to set these trust headers before Go ReverseProxy processes the inbound Connection header, allowing an unauthenticated client to name and remove the configured headers before the request reaches the backend. Deployments that enable the corresponding proxy.header options can therefore lose client-IP, TLS-termination, or request-correlation signals used by backend authorization and auditing; the options are empty by default, and the hardcoded protected forwarded headers are unaffected. This issue is fixed in version 1.7.2.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","score":5.8,"severity":null}],"references":["https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v","https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357","https://github.com/fabiolb/fabio/releases/tag/v1.7.2"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-83986","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 21, 2026, 4:11:21 PM","dateUpdated":"Sep 21, 2026, 6:04:03 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-83986","identifiers":["EUVD-2026-83986","CVE-2026-62987","GHSA-fq95-v8xc-jm3v"]},"retained":false,"historicalAffected":[]},{"revision":"4b65d83a47f74f95984c0f2269b32c00","observedAt":"2026-10-25T14:19:28.838+00:00","statement":{"source":"nvd","id":"CVE-2026-62987","aliases":[],"title":"Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in proxy/http_headers.go uses protectHeaders for a hardcoded set of forwarded headers but omits the operator-con…","description":"Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in proxy/http_headers.go uses protectHeaders for a hardcoded set of forwarded headers but omits the operator-configured ClientIPHeader, TLSHeader, and RequestID names. In proxy/http_proxy.go, HTTPProxy.ServeHTTP calls addHeaders to set these trust headers before Go ReverseProxy processes the inbound Connection header, allowing an unauthenticated client to name and remove the configured headers before the request reaches the backend. Deployments that enable the corresponding proxy.header options can therefore lose client-IP, TLS-termination, or request-correlation signals used by backend authorization and auditing; the options are empty by default, and the hardcoded protected forwarded headers are unaffected. This issue is fixed in version 1.7.2.","state":0,"publishedAt":"2026-09-21T17:17:38.34+00:00","modifiedAt":"2026-09-24T21:25:27.05+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","score":5.8,"severity":"MEDIUM"}],"references":["https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357","https://github.com/fabiolb/fabio/releases/tag/v1.7.2","https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-62987","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-290","CWE-348"],"productCriteria":[],"sourceDates":{"published":"2026-09-21T17:17:38.340","lastModified":"2026-09-24T21:25:27.050"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-62987","identifiers":["CVE-2026-62987"]},"retained":false,"historicalAffected":[]},{"revision":"50f16e1bef514800860697e7ac444871","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-fq95-v8xc-jm3v","aliases":["CVE-2026-62987","GO-2026-6566"],"title":"Fabio - Incomplete fix for CVE-2025-48865: operator-configured trust headers (clientip/tls/requestid) still strippable via the Connection header","description":"**Affected:** github.com/fabiolb/fabio >= 1.6.6 through 1.7.1 and master HEAD (c75f8a6).\n\n### Summary\nThe v1.6.6 fix for CVE-2025-48865 sweeps the client `Connection` header against a hardcoded allowlist `protectHeaders` (proxy/http_headers.go:28-36) containing only the 7 X-Forwarded family headers. Fabio also injects three *operator-configured* server-side trust headers that are NOT in that allowlist, so the original hop-by-hop stripping attack still works against them.\n\n### Details\nThe three unprotected trust headers and where fabio sets them:\n- ClientIPHeader (`proxy.header.clientip`) - http_headers.go:73 `r.Header.Set(cfg.ClientIPHeader, remoteIP)`\n- TLSHeader (`proxy.header.tls`) - http_headers.go:153 `r.Header.Set(cfg.TLSHeader, cfg.TLSHeaderValue)` (TLS connections)\n- RequestID (`proxy.header.requestid`) - http_proxy.go:90 `r.Header.Set(p.Config.RequestID, id())`\n\nOrder of operations in HTTPProxy.ServeHTTP: (1) line 90 sets RequestID; (2) line 175 calls addHeaders, which sweeps the Connection header (keeping the three configured names because they are absent from protectHeaders) and then sets ClientIPHeader/TLSHeader; (3) line 223 runs the Go `httputil.ReverseProxy`, whose `removeHopByHopHeaders` (Go stdlib net/http/httputil/reverseproxy.go) iterates the inbound `Connection` header and `h.Del`s every listed header. The three trust headers fabio just set are therefore deleted before the request reaches the backend.\n\n### PoC\nConfigure `proxy.header.clientip=X-Client-IP`, `proxy.header.requestid=X-Request-ID`. Raw request:\n```\nGET / HTTP/1.1\nHost: foo.com\nConnection: close, X-Client-IP, X-Request-ID\n```\nBackend sees `X-Client-IP: <empty>` and `X-Request-ID: <empty>`. Baseline (`Connection: close`) => backend sees the real client IP and a request id. The same works for `proxy.header.tls` over TLS (`Connection: close, X-Secure` strips the TLS assertion). Reproduced by the two PASS-ing tests in proxy/poc_cve48865_incomplete_test.go on master HEAD (Go 1.26.4). Control: `X-Forwarded-For` (in protectHeaders) survives, confirming the gap is specific to the configured headers.\n\n### Impact\nWhere a backend trusts these fabio-set headers, an external unauthenticated client can strip/downgrade the trust signal: bypass/poison IP-based ACL or audit that reads the clientip header, downgrade a TLS-terminated request to appear non-TLS to a backend keying off the TLS header, or drop request-id correlation. Scope: deployments that enable the relevant `proxy.header.*` option (all empty by default). Fix: add the configured ClientIPHeader/TLSHeader/RequestID names to the protectHeaders set (or strip their token from the inbound Connection header) inside addHeaders.\n\nParent: CVE-2025-48865 / GHSA-q7p4-7xjv-j3wf (fixed in v1.6.6). This is an incomplete-fix sibling - the same hop-by-hop stripping primitive applies to the operator-configured trust headers the allowlist does not cover.","state":0,"publishedAt":"2026-09-22T20:34:22+00:00","modifiedAt":"2026-10-01T20:55:42.1776552+00:00","affected":[{"ecosystem":"Go","name":"github.com/fabiolb/fabio","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.6.6"},{"kind":"fixed","version":"1.7.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v","https://nvd.nist.gov/vuln/detail/CVE-2026-62987","https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357","https://github.com/fabiolb/fabio","https://github.com/fabiolb/fabio/releases/tag/v1.7.2"],"sourceUrl":"https://github.com/advisories/GHSA-fq95-v8xc-jm3v","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-fq95-v8xc-jm3v","identifiers":["GHSA-fq95-v8xc-jm3v","CVE-2026-62987","GO-2026-6566"]},"retained":false,"historicalAffected":[]},{"revision":"47e0b08b585b4f03ba87ab4396b98d4e","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6566","aliases":["CVE-2026-62987","GHSA-fq95-v8xc-jm3v"],"title":"Fabio - Incomplete fix for CVE-2025-48865: operator-configured trust headers (clientip/tls/requestid) still strippable via the Connection header in github.com/fabiolb/fabio","description":"Fabio - Incomplete fix for CVE-2025-48865: operator-configured trust headers (clientip/tls/requestid) still strippable via the Connection header in github.com/fabiolb/fabio","state":0,"publishedAt":"2026-10-01T20:23:56+00:00","modifiedAt":"2026-10-01T20:45:14.0794523+00:00","affected":[{"ecosystem":"Go","name":"github.com/fabiolb/fabio","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.6.6"},{"kind":"fixed","version":"1.7.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v","https://nvd.nist.gov/vuln/detail/CVE-2026-62987","https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357","https://github.com/fabiolb/fabio/releases/tag/v1.7.2"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6566","license":"OSV · upstream source license applies","key":"osv:GO-2026-6566","identifiers":["GO-2026-6566","CVE-2026-62987","GHSA-fq95-v8xc-jm3v"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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