CVE-2026-95811 lemonldap-ng CVE debrief

Who should care

Defenders and administrators of Lemonldap::NG::Handler installations should assess exposure and prioritize updating to fixed versions. This includes reviewing and updating locationRules, monitoring for potential exploitation attempts, and verifying affected versions. Security teams and vulnerability management teams should also review the vulnerability and implement compensating controls where necessary.

Why it matters

CVE-2026-95811 is a vulnerability in Lemonldap::NG::Handler that allows bypassing of locationRules, potentially leading to unauthorized access to protected resources. Defenders and administrators of Lemonldap::NG::Handler installations should assess exposure and prioritize updating to fixed versions.

• Bypassing of locationRules could allow unauthorized access to protected resources
• Potential for lateral movement within the network
• Need for verification of affected versions and updating to fixed versions
• Possible impact on authentication and authorization mechanisms

Technical summary

The vulnerability in Lemonldap::NG::Handler allows an attacker to bypass locationRules by percent-encoding a character of the path, inserting dot segments, or doubling a slash. This affects versions from 2.0.0 before 2.16.10, from 2.17.0 before 2.21.6, and from 2.22.0 before 2.23.4. Only a vhost whose default rule is more permissive than its other rules is affected. Defenders should prioritize verifying affected versions and updating to fixed versions to prevent bypassing of locationRules. The CVE record and NVD vulnerability detail provide information on the affected versions and the nature of the vulnerability.

Defensive priority

Defenders should prioritize verifying affected versions and updating to fixed versions (2.16.10, 2.21.6, or 2.23.4) to prevent bypassing of locationRules.

Recommended defensive actions

• Verify affected versions and update to fixed versions (2.16.10, 2.21.6, or 2.23.4)
• Review and update locationRules to ensure they are not bypassed
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail provide information on the affected versions and the nature of the vulnerability. However, the corpus does not establish versions, exploitation, impact, or remediation beyond what is provided by the official sources.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.