CVE-2026-104074

Coturn 4.10.0 contains an uninitialized memory disclosure vulnerability that allows remote unauthenticated attackers to leak stack memory contents by sending a TURN Allocate request without credentials. Attackers can exploit the stun_init_error_response_common_str() function in src/client/ns_turn_msg.c, which fails to zero-initialize the avalue buffer before computing its length with strlen() and copying leaked stack bytes into the ERROR-CODE reason phrase, exposing pointer fragments that weaken ASLR and enable precise version fingerprinting.

• https://github.com/coturn/coturn/commit/741b2983cc52f967dd08c438fd72a5f08f13ca27
• https://github.com/coturn/coturn/pull/1878
• https://github.com/coturn/coturn/releases/tag/4.11.0