Out-of-bounds write in Asterisk Open Source and Certified Asterisk - CVE-2026-57189
Published: June 26, 2026
Vulnerability identifier: #VU135551
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-57189
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code or cause a denial of service.
The vulnerability exists due to out-of-bounds write in T.140 RED generation handling when processing carefully crafted packets. A remote user can send carefully crafted packets to execute arbitrary code or cause a denial of service.
Only systems using the chan_sip channel driver with the textsupport option enabled are vulnerable.
Affected software
Asterisk Open Source
Certified Asterisk
Certified Asterisk
How to mitigate CVE-2026-57189
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