{"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-2026-41181 in the wild and no public exploit code.","fix":"Upgrade github.com/traefik/traefik/v3 to a fixed version for your release line: 3.6.15 or 3.7.0-rc.3.","what":"CVE-2026-41181 is a medium-severity vulnerability in Traefik Traefik, published on 15 May 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-2026-41181 and fix it if it is affected.\n\nWhat it is: CVE-2026-41181 is a medium-severity vulnerability in Traefik Traefik, published on 15 May 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-2026-41181 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 3.6.15, 3.7.0-rc.3\n- github.com/traefik/traefik/v3 (Go): affected all versions; fixed in 3.6.15\n- github.com/traefik/traefik/v3 (Go): affected all versions; fixed in 3.6.15\n- github.com/traefik/traefik/v3 (Go): affected from 3.7.0-rc.0; fixed in 3.7.0-rc.3\n- github.com/traefik/traefik/v3 (Go): affected from 3.7.0-rc.0; fixed in 3.7.0-rc.3\n- github.com/traefik/traefik (Go): affected all versions; no fix listed\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.44\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.44\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.44\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-2026-41181/ (Markdown: https://insights.sbomify.com/CVE-2026-41181/index.md)","id":"CVE-2026-41181","markdown":"https://insights.sbomify.com/CVE-2026-41181/index.md","name":"CVE-2026-41181","record":{"aliases":["CLEANSTART-2026-MZ53124","GHSA-p6hg-qh38-555r","GO-2026-5532","MINI-3ffm-m726-x3rp","MINI-725w-72xx-rh8w","MINI-hcqc-4x7j-73r9","openSUSE-SU-2026:10713-1","openSUSE-SU-2026:10714-1"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"HTTP reverse proxy","requires_auth":"none","summary":"Traefik's errors middleware leaks sensitive headers like Authorization and Cookie to error page services, exposing user credentials to unintended infrastructure.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"traefik","vendor":"traefik"}],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-201","name":"Insertion of Sensitive Information Into Sent Data"}],"description":"Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.44, 3.6.15, and 3.7.0-rc.3, there is an information disclosure vulnerability in Traefik's errors (custom error pages) middleware. When the backend returns a response matching the configured status range, the middleware forwards the original request's complete header set, including Authorization, Cookie, and other authentication material, to the separate error page service rather than only the minimal context needed to render the error page. This behavior is undocumented: the documentation states only that Host is forwarded by default, so operators are not warned that sensitive credentials are shared across service boundaries. Deployments using the errors middleware with a distinct error page service may inadvertently expose end-user credentials to infrastructure that was not intended to receive them. This vulnerability is fixed in 2.11.44, 3.6.15, and 3.7.0-rc.3.","ecosystems":["Go","openSUSE:Tumbleweed"],"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: Errors middleware forwards Authorization and Cookie headers to separate error page service","id":"CVE-2026-41181","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"traefik:traefik","products":["traefik:traefik"],"type":"information_disclosure","year":"2026"},"n_packages":11,"n_references":4,"next":{"headline":"LangSmith SDK: Streaming token events bypass output redaction","id":"CVE-2026-41182"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","source":"GO-2026-5532"},{"ecosystem":"Go","fixed":["2.11.44"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":null,"source":"GHSA-p6hg-qh38-555r"},{"ecosystem":"Go","fixed":["2.11.44"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GHSA-p6hg-qh38-555r"},{"ecosystem":"Go","fixed":["2.11.44"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GO-2026-5532"},{"ecosystem":"Go","fixed":["3.6.15","3.7.0-rc.3"],"introduced":["0","3.7.0-rc.1"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GO-2026-5532"},{"ecosystem":"Go","fixed":["3.6.15"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":null,"source":"GHSA-p6hg-qh38-555r"},{"ecosystem":"Go","fixed":["3.6.15"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GHSA-p6hg-qh38-555r"},{"ecosystem":"Go","fixed":["3.7.0-rc.3"],"introduced":["3.7.0-rc.0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":null,"source":"GHSA-p6hg-qh38-555r"},{"ecosystem":"Go","fixed":["3.7.0-rc.3"],"introduced":["3.7.0-rc.0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GHSA-p6hg-qh38-555r"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["3.6.16-1.1"],"introduced":["0"],"last_affected":[],"package":"traefik","purl":"pkg:rpm/opensuse/traefik\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:10713-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["2.11.45-1.1"],"introduced":["0"],"last_affected":[],"package":"traefik2","purl":"pkg:rpm/opensuse/traefik2\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:10714-1"}],"prev":{"headline":"PsiTransfer: Upload PATCH path traversal can create `config.\u003cNODE_ENV\u003e.js` and lead to code execution on restart","id":"CVE-2026-41180"},"products":["traefik"],"published":"2026-05-15","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":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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":"2026-05-16","vendors":["traefik"]},"summary":"Traefik's errors middleware leaks sensitive headers like Authorization and Cookie to error page services, exposing user credentials to unintended infrastructure.","url":"https://insights.sbomify.com/CVE-2026-41181/"}