CVE-2026-104074 Coturn 4.10.0 Uninitialized Stack Memory Disclosure via ERROR-CODE
Remote attackers can leak stack memory via unauthenticated TURN requests, exposing pointer fragments that weaken ASLR and enable version fingerprinting.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-104074?
CVE-2026-104074 is a medium-severity vulnerability in coturn, published on 7 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-908
Which versions are affected by CVE-2026-104074?
How do I fix CVE-2026-104074?
Apply the vendor's patch.
Is CVE-2026-104074 being exploited?
There is no known exploitation of CVE-2026-104074 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-104074, GHSA-6h6j-pfrh-66v3, UBUNTU-CVE-2026-104074.