Stack-based buffer overflow in Asterisk Open Source and Certified Asterisk - CVE-2026-57191
Published: June 26, 2026
Vulnerability identifier: #VU135538
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-2026-57191
CWE-ID: CWE-121
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 a stack-based buffer overflow in Message-Account parsing in res_pjsip_pubsub when handling a crafted MWI NOTIFY packet. A remote attacker can send a carefully crafted packet to cause a denial of service.
The issue can corrupt the underlying transport and permanently disable SIP functionality until the service is restarted.
How to mitigate CVE-2026-57191
Install security update from vendor's website.