CVE-2026-23740: Sangoma Asterisk

High severity, CVSS 7.8. EPSS: 0.1% chance of exploitation in the next 30 days.

Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.

Affected products

• Sangoma Asterisk: before 20.18.2 (fixed in 20.18.2); from 21.0.0, before 21.12.1 (fixed in 21.12.1); from 22.0.0, before 22.8.2 (fixed in 22.8.2); from 23.0.0, before 23.2.2 (fixed in 23.2.2)
• Sangoma Certified Asterisk: version 13.13.0 only; version 16.8 only; version 16.8.0 only; version 18.9 only; version 20.7 only

Published 2026-02-06. Last modified 2026-06-17.