{"answers":{"affected":"9 open source packages ship an affected version, including github.com/traefik/traefik/v3, github.com/traefik/traefik and github.com/traefik/traefik/v2. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-54763 in the wild and no public exploit code.","fix":"Upgrade github.com/traefik/traefik/v3 to a fixed version for your release line: 3.6.22 or 3.7.6.","what":"CVE-2026-54763 is a high-severity authentication bypass vulnerability in Traefik Traefik, published on 6 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-54763 and fix it if it is affected.\n\nWhat it is: CVE-2026-54763 is a high-severity authentication bypass vulnerability in Traefik Traefik, published on 6 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-54763 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/traefik/traefik/v3 (Go): affected all versions; fixed in 3.6.22, 3.7.6\n- github.com/traefik/traefik/v3 (Go): affected all versions; fixed in 3.6.22\n- github.com/traefik/traefik/v3 (Go): affected all versions; fixed in 3.6.22\n- github.com/traefik/traefik/v3 (Go): affected from 3.7.0; fixed in 3.7.6\n- github.com/traefik/traefik/v3 (Go): affected from 3.7.0; fixed in 3.7.6\n- github.com/traefik/traefik (Go): affected all versions; no fix listed\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.51\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.51\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.51\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-54763/ (Markdown: https://insights.sbomify.com/CVE-2026-54763/index.md)","id":"CVE-2026-54763","markdown":"https://insights.sbomify.com/CVE-2026-54763/index.md","name":"CVE-2026-54763","record":{"aliases":["GHSA-x677-9fxg-v5c5","GO-2026-6211","MINI-5xmp-q2qc-2h34","MINI-p6f8-r3f5-4pfp","MINI-q6mh-hqhr-h6cp"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["privilege_escalation","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Traefik reverse proxy","requires_auth":"none","summary":"Attackers can spoof identity headers via underscore variants in Traefik's auth middlewares, bypassing authentication controls to access protected routes.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"traefik","vendor":"traefik"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"},{"id":"CWE-290","name":"Authentication Bypass by Spoofing"},{"id":"CWE-178","name":"Improper Handling of Case Sensitivity"}],"description":"Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth","id":"CVE-2026-54763","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"traefik:traefik","products":["traefik:traefik"],"type":"auth_bypass","year":"2026"},"n_packages":9,"n_references":3,"next":{"headline":"ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false","id":"CVE-2026-54764"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","source":"GO-2026-6211"},{"ecosystem":"Go","fixed":["2.11.51"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":null,"source":"GHSA-x677-9fxg-v5c5"},{"ecosystem":"Go","fixed":["2.11.51"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GHSA-x677-9fxg-v5c5"},{"ecosystem":"Go","fixed":["2.11.51"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GO-2026-6211"},{"ecosystem":"Go","fixed":["3.6.22","3.7.6"],"introduced":["0","3.7.0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GO-2026-6211"},{"ecosystem":"Go","fixed":["3.6.22"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":null,"source":"GHSA-x677-9fxg-v5c5"},{"ecosystem":"Go","fixed":["3.6.22"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GHSA-x677-9fxg-v5c5"},{"ecosystem":"Go","fixed":["3.7.6"],"introduced":["3.7.0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":null,"source":"GHSA-x677-9fxg-v5c5"},{"ecosystem":"Go","fixed":["3.7.6"],"introduced":["3.7.0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GHSA-x677-9fxg-v5c5"}],"prev":{"headline":"Traefik Kubernetes Ingress NGINX provider fails open when auth-secret resolution fails","id":"CVE-2026-54762"},"products":["traefik"],"published":"2026-07-06","related":[{"cvss_score":9.8,"headline":"HTTP client can remove the X-Forwarded headers in Traefik","id":"CVE-2024-45410","kev_date_added":null,"published":"2024-09-19"},{"cvss_score":9.3,"headline":"Traefik v3.7.0 Authentication Bypass via from-to-www-redirect","id":"CVE-2026-88877","kev_date_added":null,"published":"2026-09-10"},{"cvss_score":9.3,"headline":"Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth","id":"CVE-2026-85595","kev_date_added":null,"published":"2026-09-04"},{"cvss_score":9.1,"headline":"Traefik HTTP/3 Backend NTLM Connection Reuse","id":"CVE-2026-88007","kev_date_added":null,"published":"2026-09-10"},{"cvss_score":8.8,"headline":"Traefik: Rootless HTTP/1 request-target routes as \"/\" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging","id":"CVE-2026-88009","kev_date_added":null,"published":"2026-09-10"},{"cvss_score":8.8,"headline":"Traefik has a possible vulnerability with the path matchers","id":"CVE-2025-32431","kev_date_added":null,"published":"2025-04-21"},{"cvss_score":8.2,"headline":"Traefik v3.7 Authentication Bypass via TLS Option Conflict","id":"CVE-2026-85596","kev_date_added":null,"published":"2026-09-04"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-08","vendors":["traefik"]},"summary":"Attackers can spoof identity headers via underscore variants in Traefik's auth middlewares, bypassing authentication controls to access protected routes.","url":"https://insights.sbomify.com/CVE-2026-54763/"}