Description
A NULL Pointer Dereference of CWE-476 exists in quassel version 0.12.4 in the quasselcore void CoreAuthHandler::handle(const Login &msg) coreauthhandler.cpp line 235 that allows an attacker to cause a denial of service.
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 | quassel | 1:0.12.5-1 | — |
| Debian 13 | quassel | 1:0.12.5-1 | — |
| Debian 12 | quassel | 1:0.12.5-1 | — |
| Debian 9 | quassel | 1:0.12.4-2+deb9u1 | DSA-4189-1 |
| Debian 8 | quassel | 1:0.10.0-2.3+deb8u4 | DSA-4189-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | quassel | 1:0.12.4-3ubuntu1.18.04.3 | USN-4594-1 |
| Ubuntu 16.04 LTS | quassel | No fix yet | — |
| Ubuntu 14.04 LTS | quassel | 0.10.0-0ubuntu2.3 | — |
Advisories 2
- USN-4594-1 quassel vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4189-1 quassel - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-4189 vendor-advisory
- GLSA-201806-04 vendor-advisory
- https://github.com/quassel/quassel/blob/master/src/core/coreauthhandler.cpp#L236
- USN-4594-1 vendor-advisory