CVE-2026-104074

MEDIUM 5.3

Coturn 4.10.0 Uninitialized Stack Memory Disclosure via ERROR-CODE

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-908
Vendor	coturn
Product	coturn
Published	Oct 7, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

coturn / coturn

4.10.0 < 4.11.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 Adam Powis of VulnCheck