Vulnerability · Published Aug 14, 2026 · Assigned by redhat

CVE-2026-74241Quay: ldap referral filter injection in quay external ldap authentication

Medium 4.8

In plain English

A medium-severity security flaw in Red Hat OpenShift Update Service from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.3%top 76.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Red Hat	Red Hat OpenShift Update Service	see references
Red Hat	Red Hat Quay 3	see references
Red Hat	Red Hat Quay 3	see references

Weakness: CWE-90 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

https://access.redhat.com/security/cve/CVE-2026-74241 vdb-entry, x_refsource_REDHAT
RHBZ#2516141 issue-tracking, x_refsource_REDHAT