{"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-2026-88008 in the wild and no public exploit code.","fix":"Upgrade github.com/traefik/traefik/v2 to 2.11.57 or later.","what":"CVE-2026-88008 is a high-severity authentication bypass 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-2026-88008 and fix it if it is affected.\n\nWhat it is: CVE-2026-88008 is a high-severity authentication bypass 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-2026-88008 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/traefik/traefik/v2 (Go): affected from 2.11.26; fixed in 2.11.57\n- github.com/traefik/traefik/v2 (Go): affected from 2.11.26; fixed in 2.11.57\n- github.com/traefik/traefik/v2 (Go): affected from 2.11.26; 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 3.4.2; fixed in 3.7.13\n- github.com/traefik/traefik/v3 (Go): affected from 3.4.2; fixed in 3.7.13\n- github.com/traefik/traefik/v3 (Go): affected from 3.4.2; 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-2026-88008/ (Markdown: https://insights.sbomify.com/CVE-2026-88008/index.md)","id":"CVE-2026-88008","markdown":"https://insights.sbomify.com/CVE-2026-88008/index.md","name":"CVE-2026-88008","record":{"aliases":["ECHO-6de7-ef62-5b7d","GHSA-w4v4-9rw7-5326","GO-2026-6468","MINI-33wc-jmw5-h843","MINI-cjqg-pwmc-cjr3","MINI-mghp-9pwm-cmf9"],"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":"Traefik fails to apply authorization and security controls to HTTP/2 requests after an h2c upgrade, allowing unauthenticated access to protected backend paths.","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,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"},{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.26 until 2.11.57 and 3.7.13, Traefik forwards a client-supplied Connection header requesting Upgrade, the Upgrade: h2c token, and HTTP2-Settings to a shared backend. If the backend accepts h2c and returns 101 Switching Protocols, Traefik enters a raw tunnel and no longer applies routers, BasicAuth, ForwardAuth, IPAllowList, RateLimit, access logging, metrics, or tracing to later HTTP/2 requests, allowing an unauthenticated request through an unprotected route to reach protected paths on the same backend. This issue is fixed in 2.11.57 and 3.7.13.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":"2026-09-27","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-27T22:58:31Z","kind":"github_poc","ref":"https://github.com/Boreas37/CVE-2026-88008-PoC","stars":0,"title":"CVE-2026-88008 - Traefik (\u003c=2.11.56 / \u003c=3.7.12): a client-controlled h2c upgrade tunnels past routers and middleware (BasicAuth/ForwardAuth/IPAllowList), unauthorised access + no access logging. Stdlib-only Python PoC + real Jetty h2c lab, verified on v3.7.12 vs v3.7.13."}],"tier":"poc_unverified"},"has_fix":true,"headline":"Traefik: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') and Incorrect Authorization","id":"CVE-2026-88008","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"traefik:traefik","products":["traefik:traefik"],"type":"auth_bypass","year":"2026"},"n_packages":7,"n_references":5,"next":{"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"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","source":"GO-2026-6468"},{"ecosystem":"Go","fixed":["2.11.57"],"introduced":["2.11.26"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":null,"source":"GHSA-w4v4-9rw7-5326"},{"ecosystem":"Go","fixed":["2.11.57"],"introduced":["2.11.26"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GHSA-w4v4-9rw7-5326"},{"ecosystem":"Go","fixed":["2.11.57"],"introduced":["2.11.26"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GO-2026-6468"},{"ecosystem":"Go","fixed":["3.7.13"],"introduced":["3.4.2"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":null,"source":"GHSA-w4v4-9rw7-5326"},{"ecosystem":"Go","fixed":["3.7.13"],"introduced":["3.4.2"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GHSA-w4v4-9rw7-5326"},{"ecosystem":"Go","fixed":["3.7.13"],"introduced":["3.4.2"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GO-2026-6468"}],"prev":{"headline":"Traefik HTTP/3 Backend NTLM Connection Reuse","id":"CVE-2026-88007"},"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: 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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-10","vendors":["traefik"]},"summary":"Traefik fails to apply authorization and security controls to HTTP/2 requests after an h2c upgrade, allowing unauthenticated access to protected backend paths.","url":"https://insights.sbomify.com/CVE-2026-88008/"}