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 vendor was contacted early about this disclosure but did not respond in any way.

References

• https://nvd.nist.gov/vuln/detail/CVE-2025-12207
• https://shimo.im/docs/vVqRMVMlrycMO63y
• https://vuldb.com/?ctiid.329877
• https://vuldb.com/?id.329877
• https://vuldb.com/?submit.673241
• https://www.openwall.com/lists/oss-security/2025/10/27/8