Description
An issue was discovered in LemonLDAP::NG before 2.0.12. Session cache corruption can lead to authorization bypass or spoofing. By running a loop that makes many authentication attempts, an attacker might alternately be authenticated as one of two different users.
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 | lemonldap-ng | 2.0.11+ds-4 | — |
| Debian 13 | lemonldap-ng | 2.0.11+ds-4 | — |
| Debian 12 | lemonldap-ng | 2.0.11+ds-4 | — |
| Debian 10 | lemonldap-ng | 2.0.2+ds-7+deb10u6 | DSA-4943-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | lemonldap-ng | No fix yet | — |
| Ubuntu 18.04 LTS | lemonldap-ng | No fix yet | — |
| Ubuntu 16.04 LTS | lemonldap-ng | No fix yet | — |
Advisories 1
- DSA-4943-1 lemonldap-ng - security update Debian Security (DSA / DLA) · Mar 9, 2026