traefik -- ACME TLS-ALPN fast path potential DoS

2026-02-07 · CVE-2026-22045 · VuXML entry

The traefik project reports: 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 goroutines 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 …

Affected versions

• traefik < 3.6.7

By system

1 still vulnerable, 1 fixed. Where VuXML applies (FreeBSD, DragonFly, FreeBSD's derivatives) a port is vulnerable while its version is in a range; pkgsrc says itself whether it lists a CVE of this advisory; OpenBSD and MidnightBSD keep no list this site reads, so their row is only an estimate: FreeBSD's ranges applied to upstream's version.