What is CVE-2026-77121?

CVE-2026-77121 is a medium-severity vulnerability in Sonatype Nexus Repository 3, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-02.

How severe is CVE-2026-77121?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Sonatype Nexus Repository 3

CVE-2026-77121

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.

Published 2026-09-02 · last modified 2026-10-07.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (15.9th percentile), scored 2026-10-18.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

103e4ec9-0a87-450b-af77-479448ddef11 (Release Notes, patch, Vendor Advisory)
103e4ec9-0a87-450b-af77-479448ddef11 (Permissions Required, vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-77121?: CVE-2026-77121 is a medium-severity vulnerability in Sonatype Nexus Repository 3, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-02.
How severe is CVE-2026-77121?: Medium severity. CVSS v3 base score is 6.5 out of 10.