Out-of-bounds write in Asterisk Open Source and Certified Asterisk - CVE-2026-57199
Published: June 26, 2026
Vulnerability identifier: #VU135541
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-57199
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Digium (Linux Support Services)
Affected software:
Asterisk Open Source
Certified Asterisk
Asterisk Open Source
Certified Asterisk
Detailed vulnerability description
The vulnerability allows a remote attacker to corrupt memory or cause a denial of service.
The vulnerability exists due to out-of-bounds write in app_sms when processing externally controlled SMS lengths. A remote attacker can supply crafted SMS length values to corrupt memory or cause a denial of service.
The issue is exposed only when the SMS dialplan application is explicitly used for routing calls to or from analog devices.
How to mitigate CVE-2026-57199
Install security update from vendor's website.