What’s Vulnerable › Vulnerabilities

CVE-2026-77121: Nexus Repository 3 - Denial of Service via Unbounded Maven POM Metadata Fields

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-10-07
• Weakness: CWE-770

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.

Affected products

• Sonatype Nexus Repository 3: from 3.26.0 before 3.95.0 — fixed in 3.95.0

How to fix

Upgrade to a fixed version: Sonatype Nexus Repository 3 3.95.0. Check the vendor advisory for mitigations.

References

• https://help.sonatype.com/en/sonatype-nexus-repository-3-95-0-release-notes.html
• https://support.sonatype.com/hc/en-us/articles/54635665756691/

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