Description
The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | kamailio | 5.4.2-1 | — |
| Debian 13 | kamailio | 5.4.2-1 | — |
| Debian 12 | kamailio | 5.4.2-1 | — |
| Debian 10 | kamailio | 5.2.1-1+deb10u1 | DLA-3438-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | kamailio | 5.3.2-1ubuntu0.1~esm1 | USN-6022-1 |
| Ubuntu Pro 18.04 LTS | kamailio | 5.1.2-1ubuntu2+esm1 | USN-6022-1 |
| Ubuntu Pro 16.04 LTS | kamailio | 4.3.4-1.1ubuntu2.1+esm1 | USN-6022-1 |
Advisories 2
- USN-6022-1 kamailio vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-3438-1 kamailio - security update Debian Security (DSA / DLA) · Mar 9, 2026