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

> Attackers can inject LDAP filter metacharacters during authentication to perform user-existence oracle attacks or influence password binding in multi-domain environments.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Aug 2026
- **Updated:** 17 Aug 2026
- **Also known as:** GHSA-x5cw-v6mp-3p93

## What is CVE-2026-74241?

CVE-2026-74241 is a medium-severity vulnerability in Red Hat OpenShift Update Service, published on 14 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query)

## Which versions are affected by CVE-2026-74241?

It affects 2 products.


Products: Redhat Openshift Update Service, Redhat Quay.

## How do I fix CVE-2026-74241?

No fix has been published for CVE-2026-74241 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-74241 being exploited?

There is no known exploitation of CVE-2026-74241 in the wild and no public exploit code.

## Other vulnerabilities in Red Hat OpenShift Update Service

- [CVE-2026-74243](https://insights.sbomify.com/CVE-2026-74243/): Quay: unauthenticated secscan notification endpoint in quay when psk is unset (medium 6.5)
- [CVE-2025-57854](https://insights.sbomify.com/CVE-2025-57854/): Osus-operator: privilege escalation via excessive /etc/passwd permissions (medium 6.4)
- [CVE-2026-74244](https://insights.sbomify.com/CVE-2026-74244/): Quay: stripe webhook accepts forged events without signature verification in quay (medium 5.9)
- [CVE-2026-74245](https://insights.sbomify.com/CVE-2026-74245/): Quay: unauthenticated exported logs download in quay (medium 5.9)
- [CVE-2026-74240](https://insights.sbomify.com/CVE-2026-74240/): Quay: jwt claim validation bypasses in quay federated robot and sso authentication (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-74241 and fix it if it is affected.

What it is: CVE-2026-74241 is a medium-severity vulnerability in Red Hat OpenShift Update Service, published on 14 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-74241 in the wild and no public exploit code.

Affected product: Red Hat OpenShift Update Service. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-74241/ (Markdown: https://insights.sbomify.com/CVE-2026-74241/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-74241
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-74241
- OSV: https://osv.dev/vulnerability/CVE-2026-74241

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-74241/
Summaries are generated and may contain mistakes; the official description above is the record.