Bug 2540978

Summary: CVE-2026-95811 lemonldap-ng: lemonldap-ng: Access control bypass via non-normalized request URI [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Vladimir Vasilev <vvasilev>
Component: lemonldap-ngAssignee: Xavier Bachelot <xavier>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: xavier
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["7096e9c2-f701-45ae-aa9c-9b0cbd093db6"]}
Fixed In Version: lemonldap-ng-2.23.4-1.el10_4 lemonldap-ng-2.23.4-1.el10_3 lemonldap-ng-2.23.4-1.el10_2 lemonldap-ng-2.23.4-1.el9 lemonldap-ng-2.23.4-1.el8 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-04 00:28:53 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2540891    

Description Vladimir Vasilev 2026-09-25 07:34:53 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 08:15:26 UTC 
FEDORA-EPEL-2026-d54ae88fef (lemonldap-ng-2.23.4-1.el10_2) has been submitted as an update to Fedora EPEL 10.2.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-d54ae88fef
Comment 2 Fedora Update System 2026-09-25 08:15:32 UTC 
FEDORA-EPEL-2026-306ffcea82 (lemonldap-ng-2.23.4-1.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-306ffcea82
Comment 3 Fedora Update System 2026-09-25 08:15:37 UTC 
FEDORA-EPEL-2026-d6a23de049 (lemonldap-ng-2.23.4-1.el8) has been submitted as an update to Fedora EPEL 8.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-d6a23de049
Comment 4 Fedora Update System 2026-09-25 08:15:41 UTC 
FEDORA-EPEL-2026-3ddfd6e04f (lemonldap-ng-2.23.4-1.el10_4) has been submitted as an update to Fedora EPEL 10.4.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-3ddfd6e04f
Comment 5 Fedora Update System 2026-09-25 08:15:46 UTC 
FEDORA-EPEL-2026-1b43c541cb (lemonldap-ng-2.23.4-1.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-1b43c541cb
Comment 6 Fedora Update System 2026-09-26 02:01:16 UTC 
FEDORA-EPEL-2026-306ffcea82 has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-306ffcea82

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 7 Fedora Update System 2026-09-26 02:14:46 UTC 
FEDORA-EPEL-2026-3ddfd6e04f has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-3ddfd6e04f

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 8 Fedora Update System 2026-09-26 02:17:45 UTC 
FEDORA-EPEL-2026-1b43c541cb has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-1b43c541cb

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 9 Fedora Update System 2026-09-26 02:20:47 UTC 
FEDORA-EPEL-2026-d54ae88fef has been pushed to the Fedora EPEL 10.2 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-d54ae88fef

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 10 Fedora Update System 2026-09-26 02:23:36 UTC 
FEDORA-EPEL-2026-d6a23de049 has been pushed to the Fedora EPEL 8 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-d6a23de049

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 11 Fedora Update System 2026-10-04 00:28:53 UTC 
FEDORA-EPEL-2026-3ddfd6e04f (lemonldap-ng-2.23.4-1.el10_4) has been pushed to the Fedora EPEL 10.4 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 12 Fedora Update System 2026-10-04 01:10:23 UTC 
FEDORA-EPEL-2026-1b43c541cb (lemonldap-ng-2.23.4-1.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 13 Fedora Update System 2026-10-04 01:25:25 UTC 
FEDORA-EPEL-2026-d54ae88fef (lemonldap-ng-2.23.4-1.el10_2) has been pushed to the Fedora EPEL 10.2 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 14 Fedora Update System 2026-10-04 01:43:46 UTC 
FEDORA-EPEL-2026-306ffcea82 (lemonldap-ng-2.23.4-1.el9) has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 15 Fedora Update System 2026-10-04 01:46:40 UTC 
FEDORA-EPEL-2026-d6a23de049 (lemonldap-ng-2.23.4-1.el8) has been pushed to the Fedora EPEL 8 stable repository.
If problem still persists, please make note of it in this bug report.