What is CVE-2026-43994?

CVE-2026-43994 is a high-severity vulnerability in Coturn, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.1/10. Published 2026-06-18.

How severe is CVE-2026-43994?

High severity. CVSS v3 base score is 8.1 out of 10.

Buffer overflow in Coturn

CVE-2026-43994

Coturn is a free open source implementation of TURN and STUN Server. Versions prior to 4.10.0 contain a stack buffer overflow in decode_oauth_token_gcm(). A uint16_t nonce_len field read from an attacker-supplied OAuth access token (0-6553…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Coturn — versions < 4.10.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-43994?: CVE-2026-43994 is a high-severity vulnerability in Coturn, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.1/10. Published 2026-06-18.
How severe is CVE-2026-43994?: High severity. CVSS v3 base score is 8.1 out of 10.