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 v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-57189
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 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.
How to mitigate CVE-2026-57189
Install security update from vendor's website.