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CVE-2026-95811 Affecting lemonldap-ng package, versions <2.16.1+ds-deb12u10

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.55% (46th percentile)

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  • Snyk IDSNYK-ECHOLATEST-LEMONLDAPNG-20137986
  • published25 Sept 2026
  • disclosed25 Sept 2026
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Introduced: 25 Sep 2026

CVE-2026-95811  (opens in a new tab)

How to fix?

Upgrade Echo:latest lemonldap-ng to version 2.16.1+ds-deb12u10 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream lemonldap-ng package and not the lemonldap-ng package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.