A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. This attack requires manipulating config files which might not be a realistic scenario in many cases. The vendor was contacted early about this disclosure but did not respond in any way.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 1.9 · kamailioNVD modified 2026-10-19 13:10
Affected (CPE criteria) 1
cpe:2.3:a:kamailio:kamailio:5.5.0:*:*:*:*:*:*:*
References 9
- https://shimo.im/docs/vVqRMVMlrycMO63y/ Exploit, Third Party Advisory
- https://vuldb.com/?ctiid.329877 Permissions Required, VDB Entry
- https://vuldb.com/?id.329877 Third Party Advisory, VDB Entry
- https://vuldb.com/?submit.673241 Third Party Advisory, VDB Entry
- https://www.openwall.com/lists/oss-security/2025/11/02/3
- http://www.openwall.com/lists/oss-security/2025/10/27/12
- http://www.openwall.com/lists/oss-security/2025/10/27/8
- https://www.openwall.com/lists/oss-security/2025/10/27/8 Issue Tracking, Mailing List
- https://shimo.im/docs/vVqRMVMlrycMO63y Exploit, Third Party Advisory