CVE-2026-77121 Nexus Repository 3 - Denial of Service via Unbounded Maven POM Metadata Fields
Authenticated users can cause permanent denial of service in a specific Maven repository by uploading oversized POM metadata, requiring admin intervention to fix.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-77121?
CVE-2026-77121 is a medium-severity denial of service vulnerability in Sonatype Nexus Repository Manager, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A user account with permission to deploy artifacts to a hosted Maven repository could upload a POM file containing an oversized metadata field. This causes future attempts to list or browse that repository's components to permanently fail until an administrator repairs the underlying data. Only the targeted repository is affected; other repositories and overall server health remain unaffected.
Weakness: CWE-770
Which versions are affected by CVE-2026-77121?
It affects 1 product.
Products include Sonatype Nexus Repository Manager.
How do I fix CVE-2026-77121?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-77121 being exploited?
There is no known exploitation of CVE-2026-77121 in the wild and no public exploit code.
Other vulnerabilities in Sonatype Nexus Repository Manager
- CVE-2019-7238 Sonatype Nexus Repository Manager Incorrect Access Control
- CVE-2019-9629 Hardcoded credentials in n/a
- CVE-2017-17717 Hardcoded credentials in n/a
- CVE-2026-3199 Nexus Repository 3 - Authenticated Remote Code Execution via Task Property Injection
- CVE-2026-5189 Nexus Repository 3 - Hardcoded Credential in Internal Database Component
Sources
Also known as GHSA-747h-p664-p8p7, MINI-jf22-xf7m-xpm5, MINI-p5h4-7xjg-3qr2.