Bug 2540979 - CVE-2026-95811 lemonldap-ng: lemonldap-ng: Access control bypass via non-normalized request URI [fedora-all]
Summary: CVE-2026-95811 lemonldap-ng: lemonldap-ng: Access control bypass via non-norm...
Keywords:
Status: ON_QA
Alias: None
Product: Fedora
Classification: Fedora
Component: lemonldap-ng
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Xavier Bachelot
QA Contact:
URL:
Whiteboard: {"flaws": ["7096e9c2-f701-45ae-aa9c-9...
Depends On:
Blocks: CVE-2026-95811
TreeView+ depends on / blocked
 
Reported: 2026-09-25 07:35 UTC by Vladimir Vasilev
Modified: 2026-09-26 02:27 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:


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Description Vladimir Vasilev 2026-09-25 07:35:00 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Fedora Update System 2026-09-25 08:14:19 UTC
FEDORA-2026-76a3490aa6 (lemonldap-ng-2.23.4-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-76a3490aa6

Comment 2 Fedora Update System 2026-09-25 08:14:27 UTC
FEDORA-2026-827241e2de (lemonldap-ng-2.23.4-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-827241e2de

Comment 3 Fedora Update System 2026-09-25 08:14:36 UTC
FEDORA-2026-33dcab55b4 (lemonldap-ng-2.23.4-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-33dcab55b4

Comment 4 Fedora Update System 2026-09-26 01:47:49 UTC
FEDORA-2026-76a3490aa6 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-76a3490aa6`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-76a3490aa6

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-09-26 02:04:14 UTC
FEDORA-2026-827241e2de has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-827241e2de`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-827241e2de

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-26 02:27:31 UTC
FEDORA-2026-33dcab55b4 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-33dcab55b4`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-33dcab55b4

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.


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