{"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-2026-26999 in the wild and no public exploit code.","fix":"Upgrade github.com/traefik/traefik/v2 to 2.11.38 or later.","what":"CVE-2026-26999 is a high-severity denial of service vulnerability in Traefik Traefik, published on 5 Mar 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-2026-26999 and fix it if it is affected.\n\nWhat it is: CVE-2026-26999 is a high-severity denial of service vulnerability in Traefik Traefik, published on 5 Mar 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-2026-26999 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 2.11.38\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.38\n- github.com/traefik/traefik/v2 (Go): affected all versions; fixed in 2.11.38\n- github.com/traefik/traefik (Go): affected all versions; no fix listed\n- github.com/traefik/traefik/v3 (Go): affected all versions; fixed in 3.6.9\n- github.com/traefik/traefik/v3 (Go): affected all versions; fixed in 3.6.9\n- github.com/traefik/traefik/v3 (Go): affected all versions; fixed in 3.6.9\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-2026-26999/ (Markdown: https://insights.sbomify.com/CVE-2026-26999/index.md)","id":"CVE-2026-26999","markdown":"https://insights.sbomify.com/CVE-2026-26999/index.md","name":"CVE-2026-26999","record":{"aliases":["CLEANSTART-2026-DR86429","GHSA-xw98-5q62-jx94","GO-2026-4594","MINI-47qm-c4mv-r93x","MINI-rp72-qv6p-cfx5"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Traefik reverse proxy","requires_auth":"none","summary":"Remote attackers can exhaust resources by stalling TLS handshakes on TCP routers, causing denial of service for all services on the entrypoint.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"traefik","vendor":"traefik"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-772","name":"Missing Release of Resource after Effective Lifetime"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.38 and 3.6.9, there is a potential vulnerability in Traefik managing TLS handshake on TCP routers. When Traefik processes a TLS connection on a TCP router, the read deadline used to bound protocol sniffing is cleared before the TLS handshake is completed. When a TLS handshake read error occurs, the code attempts a second handshake with different connection parameters, silently ignoring the initial error. A remote unauthenticated client can exploit this by sending an incomplete TLS record and stopping further data transmission, causing the TLS handshake to stall indefinitely and holding connections open. By opening many such stalled connections in parallel, an attacker can exhaust file descriptors and goroutines, degrading availability of all services on the affected entrypoint. This issue has been patched in versions 2.11.38 and 3.6.9.","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: tcp router clears read deadlines before tls forwarding, enabling stalled handshakes (slowloris doS)","id":"CVE-2026-26999","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"traefik:traefik","products":["traefik:traefik"],"type":"denial_of_service","year":"2026"},"n_packages":7,"n_references":3,"next":{"headline":"OpenClaw: Unsanitized CWD path injection into LLM prompts","id":"CVE-2026-27001"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","source":"GO-2026-4594"},{"ecosystem":"Go","fixed":["2.11.38"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":null,"source":"GHSA-xw98-5q62-jx94"},{"ecosystem":"Go","fixed":["2.11.38"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GHSA-xw98-5q62-jx94"},{"ecosystem":"Go","fixed":["2.11.38"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","source":"GO-2026-4594"},{"ecosystem":"Go","fixed":["3.6.9"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":null,"source":"GHSA-xw98-5q62-jx94"},{"ecosystem":"Go","fixed":["3.6.9"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GHSA-xw98-5q62-jx94"},{"ecosystem":"Go","fixed":["3.6.9"],"introduced":["0"],"last_affected":[],"package":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","source":"GO-2026-4594"}],"prev":{"headline":"Traefik: unbounded io.ReadAll on auth server response body causes OOM denial of service(DOS)","id":"CVE-2026-26998"},"products":["traefik"],"published":"2026-03-05","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":"2026-07-15","vendors":["traefik"]},"summary":"Remote attackers can exhaust resources by stalling TLS handshakes on TCP routers, causing denial of service for all services on the entrypoint.","url":"https://insights.sbomify.com/CVE-2026-26999/"}