{"answers":{"affected":"7 open source packages ship an affected version, including github.com/traefik/traefik/v2, github.com/traefik/traefik and github.com/traefik/traefik/v3. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-88009 in the wild and no public exploit code.","fix":"Upgrade github.com/traefik/traefik/v2 to 2.11.57 or later.","what":"CVE-2026-88009 is a high-severity vulnerability in Traefik Traefik, published on 10 Sep 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-2026-88009 and fix it if it is affected.\n\nWhat it is: CVE-2026-88009 is a high-severity vulnerability in Traefik Traefik, published on 10 Sep 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-2026-88009 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.57\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.57\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.57\n- github.com/traefik/traefik (Go): affected all versions; no fix listed\n- github.com/traefik/traefik/v3 (Go): affected from 3.0.0; fixed in 3.7.13\n- github.com/traefik/traefik/v3 (Go): affected from 3.0.0; fixed in 3.7.13\n- github.com/traefik/traefik/v3 (Go): affected from 3.0.0; fixed in 3.7.13\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-2026-88009/ (Markdown: https://insights.sbomify.com/CVE-2026-88009/index.md)","id":"CVE-2026-88009","markdown":"https://insights.sbomify.com/CVE-2026-88009/index.md","name":"CVE-2026-88009","record":{"aliases":["ECHO-4418-b246-3ebf","GHSA-f52w-8j3h-j724","GO-2026-6465","MINI-8xxv-cmpq-xwpx","MINI-gjmm-f26x-wchj","MINI-p89f-3c69-v3v7"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"HTTP reverse proxy","requires_auth":"none","summary":"Attackers can bypass path-scoped routing, authorization, and logging in Traefik by sending rootless HTTP/1 request targets, potentially accessing unauthorized resources.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"traefik","vendor":"traefik"}],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"},{"id":"CWE-1286","name":"Improper Validation of Syntactic Correctness of Input"}],"description":"Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":"2026-10-25","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-10-25T00:02:07Z","kind":"github_poc","ref":"https://github.com/Boreas37/CVE-2026-88009-PoC","stars":0,"title":"CVE-2026-88009 — Traefik forwards a rootless opaque request target that routing/forwardAuth see as '/'. Auth bypass + access-log evasion, verified v3.7.10 / v3.7.13."}],"tier":"poc_unverified"},"has_fix":true,"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","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"traefik:traefik","products":["traefik:traefik"],"type":"security_feature_bypass","year":"2026"},"n_packages":7,"n_references":5,"next":{"headline":"Traefik: BasicAuth singleflight coalescing reintroduces an unauthenticated username-enumeration timing oracle","id":"CVE-2026-88010"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","source":"GO-2026-6465"},{"ecosystem":"Go","fixed":["2.11.57"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":null,"source":"GHSA-f52w-8j3h-j724"},{"ecosystem":"Go","fixed":["2.11.57"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GHSA-f52w-8j3h-j724"},{"ecosystem":"Go","fixed":["2.11.57"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GO-2026-6465"},{"ecosystem":"Go","fixed":["3.7.13"],"introduced":["3.0.0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":null,"source":"GHSA-f52w-8j3h-j724"},{"ecosystem":"Go","fixed":["3.7.13"],"introduced":["3.0.0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GHSA-f52w-8j3h-j724"},{"ecosystem":"Go","fixed":["3.7.13"],"introduced":["3.0.0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GO-2026-6465"}],"prev":{"headline":"Traefik: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') and Incorrect Authorization","id":"CVE-2026-88008"},"products":["traefik"],"published":"2026-09-10","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 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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-10","vendors":["traefik"]},"summary":"Attackers can bypass path-scoped routing, authorization, and logging in Traefik by sending rootless HTTP/1 request targets, potentially accessing unauthorized resources.","url":"https://insights.sbomify.com/CVE-2026-88009/"}