{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-121966 in the wild and no public exploit code.","exposure":"","fix":"No fix has been published for CVE-2026-121966 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-121966 is a high-severity vulnerability in traefik, published on 4 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-121966 and fix it if it is affected.\n\nWhat it is: CVE-2026-121966 is a high-severity vulnerability in traefik, published on 4 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-121966 in the wild and no public exploit code.\n\nAffected product: traefik. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-121966/ (Markdown: https://insights.sbomify.com/CVE-2026-121966/index.md)","id":"CVE-2026-121966","markdown":"https://insights.sbomify.com/CVE-2026-121966/index.md","name":"CVE-2026-121966","record":{"aliases":["GHSA-6cm8-r9cr-2hc7","GHSA-hrpp-p4fc-wwf8"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"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-488","name":"Exposure of Data Element to Wrong Session"}],"description":"Traefik 2.x before 2.11.60 and 3.x before 3.7.16 sends ForwardAuth subrequests (and, in 3.7, Ingress NGINX auth-url requests) through an auth-server connection pool shared by all clients, exposing connection-bound NTLM or Negotiate authentication. An unauthenticated attacker can reuse another user's authenticated connection, receiving the victim's identity via authResponseHeaders to access backends as that user.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Traefik before 2.11.60 and 3.7.16 ForwardAuth NTLM/Negotiate Identity Leak","id":"CVE-2026-121966","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Coder before 2.29.22, 2.34.13, 2.35.10, 2.36.8, 2.37.5, and 2.38.1 AI Gateway Path Traversal","id":"CVE-2026-121967"},"nickname":null,"packages":[],"prev":{"headline":"Parse Server before 8.6.113 and 9.10.6-alpha.5 Prototype Pollution via Dot Notation Key","id":"CVE-2026-121965"},"products":["traefik"],"published":"2026-11-04","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-11-04","vendors":["traefik"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-121966/"}