Nexus Repo: Oversized POM Metadata Causes Permanent Browse Failures
CVE-2026-77121 Published on September 2, 2026
Nexus Repository 3 - Denial of Service via Unbounded Maven POM Metadata Fields
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.
Vulnerability Analysis
CVE-2026-77121 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-77121
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Affected Versions
Sonatype Nexus Repository 3:- Version 3.26.0 and below 3.95.0 is affected.