Vulnerability in Coturn
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/coturn/coturn/releases/tag/4.11.0 (release-notes)
- github.com/coturn/coturn/pull/1878 (issue-tracking)
- github.com/coturn/coturn/commit/741b2983cc52f967dd08c438fd72a5f08f13ca27 (patch)
Frequently asked questions
- What is CVE-2026-104074?
- CVE-2026-104074 is a medium-severity vulnerability in Coturn, classified under Use of Uninitialized Resource. CVSS score: 5.3/10. Published 2026-10-07.
- How severe is CVE-2026-104074?
- Medium severity. CVSS v3 base score is 5.3 out of 10.