Out-of-bounds write in Asterisk Open Source and Certified Asterisk - CVE-2026-57192
Published: June 26, 2026
Vulnerability identifier: #VU135545
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-57192
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to out-of-bounds write in the Codec2 decoder when processing carefully crafted Codec2 audio packets during a call. A remote user can send crafted Codec2 audio packets to cause a denial of service.
The codec_codec2 module must be loaded, the codec2 codec must be configured on the attacked endpoint, and user authentication is required to establish a call using the codec.
Affected software
Asterisk Open Source
Certified Asterisk
Certified Asterisk
How to mitigate CVE-2026-57192
Install security update from vendor's website.
Asterisk Open Source - addressed in versions 20.20.1, 21.12.3, 22.10.1, 23.4.1
Certified Asterisk - addressed in versions 20.7-cert11, 22.8-cert3
Certified Asterisk - addressed in versions 20.7-cert11, 22.8-cert3