{"cve":"CVE-2026-22045","nvd":{"published":"2026-01-15T23:15:51.593","modified":"2026-06-17T10:19:25.200","status":"Analyzed","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.35 and 3.6.7, there is a potential vulnerability in Traefik ACME TLS certificates' automatic generation: the ACME TLS-ALPN fast path can allow unauthenticated clients to tie up go routines and file descriptors indefinitely when the ACME TLS challenge is enabled. A malicious client can open many connections, send a minimal ClientHello with acme-tls/1, then stop responding, leading to denial of service of the entry point. The vulnerability is fixed in 2.11.35 and 3.6.7.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://github.com/traefik/traefik/commit/e9f3089e9045812bcf1b410a9d40568917b26c3d","https://github.com/traefik/traefik/releases/tag/v2.11.35","https://github.com/traefik/traefik/releases/tag/v3.6.7","https://github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwq"],"products":["traefik:traefik"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2026-22045","score":0.00343,"percentile":0.27813,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-cwjm-3f7h-9hwq","url":"https://osv.dev/vulnerability/GHSA-cwjm-3f7h-9hwq","summary":"Traefik's ACME TLS-ALPN fast path lacks timeouts and close on handshake stall","modified":"2026-04-16T02:14:30.740561552Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.6.7"],"fixed":["3.6.7"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.11.35"],"fixed":["2.11.35"]}]},{"id":"GO-2026-4322","url":"https://osv.dev/vulnerability/GO-2026-4322","summary":"Traefik's ACME TLS-ALPN fast path lacks timeouts and close on handshake stall in github.com/traefik/traefik","modified":"2026-04-16T02:14:30.320697106Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.11.35"],"fixed":["2.11.35"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.6.7"],"fixed":["3.6.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}