CVE-2026-23741: Sangoma Asterisk

High severity, CVSS 8.8. EPSS: 0.2% 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, the asterisk/contrib/scripts/ast_coredumper runs as root, as noted by the NOTES tag on line 689 of the ast_coredumper file. The script will source the contents of /etc/asterisk/ast_debug_tools.conf, which resides in a folder that is writeable by the asterisk user:group. Due to the /etc/asterisk/ast_debug_tools.conf file following bash semantics and it being loaded; an attacker with write permissions may add or modify the file such that when the root ast_coredumper is run; it would source and thereby execute arbitrary bash code found in the /etc/asterisk/ast_debug_tools.conf. 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: up to and including 18.9; version 20.7 only

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