CVE-2026-77121
6.5 · MEDIUMA user account with permission to deploy artifacts to a hosted Maven repository could upload a POM file containing an oversized metadata field.
Overview
CVE-2026-77121 is a medium-severity vulnerability affecting sonatype nexus_repository_manager. It was published on September 2, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from sonatype. Update nexus_repository_manager to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| sonatype | nexus_repository_manager | >= 3.26.0, < 3.95.0 | Affected |
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Frequently asked questions
What is CVE-2026-77121?
CVE-2026-77121 is a medium-severity vulnerability affecting sonatype nexus_repository_manager. It was published on September 2, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2026-77121?
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-77121?
Check the references section for vendor advisories and patches from sonatype. Update nexus_repository_manager to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-77121?
CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-77121 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.
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