CVE-2026-73213 Coturn: `addr_less_eq()` does a component-wise IPv6 comparison instead of a lexicographic one, letting an authenticated TURN client bypass `denied-peer-ip`/`allowed-peer-ip` IPv6 ranges (TURN-specific SSRF)

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addrlesseq in src/client/nsturnioaddr.c uses a component-wise comparison for native IPv6 min-max intervals in ioaaddrinrange, allowing an authenticated TURN client to relay to an IPv6 peer that is numerically...

CVE-2026-73213

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addrlesseq in src/client/nsturnioaddr.c uses a component-wise comparison for native IPv6 min-max intervals in ioaaddrinrange, allowing an authenticated TURN client to relay to an IPv6 peer that is numerically...

CVE-2026-73213

CVE-2026-73213 affects the Coturn TURN/STUN server. Prior to 4.16.0, addr_less_eq() used a component-wise IPv6 comparison in ioa_addr_in_range(), allowing an authenticated TURN client to relay to an IPv6 peer that is numerically within a configured denied-peer-ip range but classified as outside i...

CVE-2026-73213 Coturn: `addr_less_eq()` does a component-wise IPv6 comparison instead of a lexicographic one, letting an authenticated TURN client bypass `denied-peer-ip`/`allowed-peer-ip` IPv6 ranges (TURN-specific SSRF)

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addrlesseq in src/client/nsturnioaddr.c uses a component-wise comparison for native IPv6 min-max intervals in ioaaddrinrange, allowing an authenticated TURN client to relay to an IPv6 peer that is numerically...

CVE-2026-73212 coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, goodpeeraddr in src/server/nsturnserver.c uses ioaaddrinrange in src/client/nsturnioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 T...

CVE-2026-73212

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, goodpeeraddr in src/server/nsturnserver.c uses ioaaddrinrange in src/client/nsturnioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 T...

CVE-2026-73212 coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, goodpeeraddr in src/server/nsturnserver.c uses ioaaddrinrange in src/client/nsturnioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 T...

CVE-2026-73212

Coturn (TURN/STUN server) vulnerability CVE-2026-73212: The function good_peer_addr() in src/server/ns_turn_server.c fails to canonicalize IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms via ioa_addr_in_range() in src/client/ns_turn_ioaddr.c. This can let an authenticated RFC 6062 TCP...

EUVD-2026-56789

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, goodpeeraddr in src/server/nsturnserver.c uses ioaaddrinrange in src/client/nsturnioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 T...

PT-2026-70830

Name of the Vulnerable Software and Affected Versions Coturn versions prior to 4.17.0 Description The turnports allocate even function in src/apps/relay/turn ports.c incorrectly marks the unused odd sibling port as TPS TAKEN ODD during an EVEN-PORT Allocate request when the reservation bit R is s...

PT-2026-70831

Name of the Vulnerable Software and Affected Versions Coturn versions prior to 4.17.0 Description The shutdown client connection function in src/server/ns turn server.c prematurely calls dec quota and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation...

PT-2026-70829

Name of the Vulnerable Software and Affected Versions Coturn versions prior to 4.16.0 Description The dtls server input handler and create new connected udp socket functions in src/apps/relay/dtls listener.c retain the state of the OpenSSL dtls1 reassemble fragment function when processing a...

PT-2026-70799

Name of the Vulnerable Software and Affected Versions Coturn versions prior to 4.13.1 Description The good peer addr function in src/server/ns turn server.c utilizes ioa addr in range in src/client/ns turn ioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms...

PT-2026-70828

Name of the Vulnerable Software and Affected Versions Coturn versions prior to 4.16.0 Description The addr less eq function in src/client/ns turn ioaddr.c uses a component-wise comparison for native IPv6 min-max intervals within ioa addr in range. This allows an authenticated TURN client to relay...

Linux Distros Unpatched Vulnerability : CVE-2026-65981

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, a server using --mobility authenticates a resumed REFRESH request with the...

Linux Distros Unpatched Vulnerability : CVE-2026-62959

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect and exposes a...

CVE-2026-65981

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, a server using --mobility authenticates a resumed REFRESH request with the resuming user's credentials but does not verify that identity against the original allocation owner, allowing an authenticated attacker...

CVE-2026-65981 Coturn: MOBILITY-TICKET session-resume authorization bypass allows cross-user TURN allocation takeover

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, a server using --mobility authenticates a resumed REFRESH request with the resuming user's credentials but does not verify that identity against the original allocation owner, allowing an authenticated attacker...

CVE-2026-65981 Coturn: MOBILITY-TICKET session-resume authorization bypass allows cross-user TURN allocation takeover

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, a server using --mobility authenticates a resumed REFRESH request with the resuming user's credentials but does not verify that identity against the original allocation owner, allowing an authenticated attacker...

CVE-2026-65981

CVE-2026-65981 affects Coturn prior to 4.15.0. A MOBILITY-TICKET–based session-resume flaw allows an authenticated attacker to bypass per-allocation authorization: a resumed REFRESH is validated against the attacker’s identity instead of the original allocation owner, enabling cross-user receipt ...