Main Vulnerability Database Vulnerabilities #VU122442

Insecure library loading in Asterisk Open Source and Certified Asterisk - CVE-2026-23740

Published: February 6, 2026

Vulnerability identifier: #VU122442

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-23740

CWE-ID: CWE-427

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to the application loads dynamic libraries in an insecure manner from the /tmp directory. A local user can place a specially crafted library file into the /tmp directory and execute arbitrary code on the system with root privileges.

Affected software

Asterisk Open Source
Certified Asterisk

How to mitigate CVE-2026-23740

Install updates from vendor's website.

Asterisk Open Source - addressed in versions 20.18.2, 21.12.1, 22.8.2, 23.2.2
Certified Asterisk - update to 20.7-cert9

External References

https://github.com/asterisk/asterisk/security/advisories/GHSA-xpc6-x892-v83c

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