Detections
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Alpine: multiple coturn packages: security update to 4.10.0-r0

medium Tenable Cloud Security Plugin ID 441025

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

 - Coturn is a free open source implementation of TURN and STUN Server. Coturn is commonly configured to
 block loopback and internal ranges using "denied-peer-ip" and/or default loopback restrictions.
 CVE-2020-26262 addressed bypasses involving "0.0.0.0", "[::1]" and "[::]", but IPv4-mapped IPv6 is not
 covered. When sending a "CreatePermission" or "ChannelBind" request with the "XOR-PEER-ADDRESS" value of
 "::ffff:127.0.0.1", a successful response is received, even though "127.0.0.0/8" is blocked via "denied-
 peer-ip". The root cause is that, prior to the updated fix implemented in version 4.9.0, three functions
 in "src/client/ns_turn_ioaddr.c" do not check "IN6_IS_ADDR_V4MAPPED". "ioa_addr_is_loopback()" checks
 "127.x.x.x" (AF_INET) and "::1" (AF_INET6), but not "::ffff:127.0.0.1." "ioa_addr_is_zero()" checks
 "0.0.0.0" and "::", but not "::ffff:0.0.0.0." "addr_less_eq()" used by "ioa_addr_in_range()" for "denied-
 peer-ip" matching: when the range is AF_INET and the peer is AF_INET6, the comparison returns 0 without
 extracting the embedded IPv4. Version 4.9.0 contains an updated fix to address the bypass of the fix for
 CVE-2020-26262. (CVE-2026-27624)

 - Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN
 attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without
 alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this
 results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict
 alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An
 unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP
 packet. This vulnerability is fixed in 4.10.0. (CVE-2026-40613)

Solution

Update the coturn library and its related packages to version 4.10.0-r0 or later.

See Also

https://security.alpinelinux.org/vuln/CVE-2026-27624

https://security.alpinelinux.org/vuln/CVE-2026-40613

Plugin Details

Severity: Medium

ID: 441025

Version: Revision 1.2

Type: Local

Published: 4/30/2026

Updated: 7/2/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.64

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-27624

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 2/24/2026

Reference Information

CVE: CVE-2026-27624, CVE-2026-40613