Description
An issue was discovered in InspIRCd 2 before 2.0.28 and 3 before 3.3.0. The mysql module contains a NULL pointer dereference when built against mariadb-connector-c 3.0.5 or newer. When combined with the sqlauth or sqloper modules, this vulnerability can be used for remote crashing of an InspIRCd server by any user able to connect to a server.
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 13 | inspircd | 3.3.0-1 | — |
| Debian 12 | inspircd | 3.3.0-1 | — |
| Debian 10 | inspircd | 2.0.27-1+deb10u1 | DSA-4764-1 |
| Debian 9 | inspircd | 2.0.23-2+deb9u1 | DLA-2375-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | inspircd | 3.4.0-2ubuntu1+esm1 | USN-7405-1 |
| Ubuntu Pro 18.04 LTS | inspircd | 2.0.24-1ubuntu1+esm1 | USN-7405-1 |
| Ubuntu Pro 16.04 LTS | inspircd | 2.0.20-5ubuntu0.1~esm1 | USN-7405-1 |
Advisories 3
- USN-7405-1 inspircd vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DSA-4764-1 inspircd - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2375-1 inspircd - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://docs.inspircd.org/security/2019-02/
- https://github.com/inspircd/inspircd/commit/2cc35d8625b7ea5cbd1d1ebb116aff86c5280162
- https://github.com/inspircd/inspircd/commit/8745660fcdac7c1b80c94cfc0ff60928cd4dd4b7
- DSA-4764 vendor-advisory
- [debian-lts-announce] 20200920 [SECURITY] [DLA 2375-1] inspircd security update mailing-list