CVE-2026-95811 Lemonldap::NG::Handler versions from 2.0.0 before 2.16.10, from 2.17.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow an equivalent

Medium 6.5 Published 25 Sep 2026 Updated 26 Sep 2026

Authenticated users can bypass locationRules restrictions via path normalization mismatches, accessing resources if the default rule is permissive.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-95811?

CVE-2026-95811 is a medium-severity authentication bypass vulnerability, published on 25 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Lemonldap::NG::Handler versions from 2.0.0 before 2.16.10, from 2.17.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow an equivalent spelling of a path to bypass the locationRules that restrict it.

The handler matches each vhost's locationRules regular expressions against REQUEST_URI, the raw request line, while the web server routes on the path it has already percent-decoded and normalized. A request that percent-encodes a character of the path, inserts dot segments, or doubles a slash therefore reaches the protected resource under a URI that no rule regexp matches, and the vhost's default rule decides access. Deny rules, identity and group conditions, and unprotect and skip rules are bypassed alike.

Only a vhost whose default rule is more permissive than its other rules is affected. An authenticated user then reaches any URL a locationRules regexp was meant to restrict, but gains no more than that default rule already grants.

Weakness: CWE-863, CWE-180

Which versions are affected by CVE-2026-95811?

How do I fix CVE-2026-95811?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-95811 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-95811 exists.

Sources

Also known as DEBIAN-CVE-2026-95811, GHSA-3rh3-f3vh-mgjh, UBUNTU-CVE-2026-95811.