Numeric Range Comparison Without Minimum Check in Asterisk Open Source and Certified Asterisk - CVE-2026-57186
Published: June 26, 2026
Vulnerability identifier: #VU135559
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-2026-57186
CWE-ID: CWE-839
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 cause a denial of service.
The vulnerability exists due to numeric range comparison without minimum check in the chan_ooh323 Q.931 party-number parser when parsing malformed Q.931 elements in an OOH323 request. A remote attacker can send a specially crafted OOH323 request to cause a denial of service.
Only systems with the chan_ooh323 addon channel driver explicitly compiled and installed are vulnerable.
How to mitigate CVE-2026-57186
Install security update from vendor's website.