Medium [CVE-2026-74241] LDAP referral filter injection in Quay external LDAP authentication
This medium-severity Red Hat Linux advisory covers CVE-2026-74241 affecting Red Hat OpenShift Update Service, Red Hat Quay 3.
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Summary
A flaw was found in Red Hat Quay's external Lightweight Directory Access Protocol (LDAP) authentication handling. When an LDAP referral is returned during authentication, the system does not properly escape the username input.
This allows an attacker to inject LDAP filter metacharacters, enabling user-existence oracle attacks at the referral Directory Name (DN). This could also potentially influence which DN is used for password binding in multi-domain Active Directory environments.
This Moderate impact flaw in Red Hat Quay's external LDAP authentication arises from improper sanitization of username input during LDAP referral processing.
While direct authentication bypass is prevented and directory enumeration is limited, an attacker could exploit this to conduct user-existence oracle attacks against referral DNs, potentially influencing password binds in multi-domain Active Directory setups. Red Hat severity: Moderate — CVSS 4.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).
Weakness: CWE-90. Affected Red Hat products: Red Hat OpenShift Update Service; Red Hat Quay 3.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
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