CVE-2026-74241

Quay: ldap referral filter injection in quay external ldap authentication

Published Aug 14, 2026 CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Workaround

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.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:2.3:a:redhat:openshift_update_service:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:quay:3.0.0:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Redhat quay 3
Vendors & Products Redhat quay 3
Type Values Removed Values Added
Description 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.
Title Quay: ldap referral filter injection in quay external ldap authentication
First Time appeared Redhat
Redhat openshift Update Service
Redhat quay
Weaknesses CWE-90
CPEs cpe:/a:redhat:openshift_update_service:5
cpe:/a:redhat:quay:3
Vendors & Products Redhat
Redhat openshift Update Service
Redhat quay
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 1, 2026, 5:03 AM
Reserved
Aug 14, 2026, 7:46 PM
Status
Analyzed
Published
Aug 14, 2026, 11:16 PM
Modified
Aug 20, 2026, 7:13 PM
Severity
Moderate
Public date
Aug 14, 2026, 12:00 AM