What’s Vulnerable › Vulnerabilities
CVE-2026-39864: Kamailio Auth: Processing Vulnerability For Additional Authenticated User Identity Checks
- Severity: medium (CVSS 4.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-08 · updated 2026-07-24
- Weakness: CWE-125
Description
Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bounds read in the auth module of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted SIP packet if a successful user authentication without a database backend is followed by additional user identity checks. This vulnerability is fixed in 6.0.5 and 5.8.7.
Affected products
- Kamailio: before 5.8.7; from 6.0.0 before 6.0.5 — fixed in 5.8.7, 6.0.5
How to fix
Upgrade to a fixed version: Kamailio 5.8.7, 6.0.5. Check the vendor advisory for mitigations.
References
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