Nexus Repository 3 - Unsafe Reflection in ExtDirect Repository Endpoint

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97666
StatePUBLISHED
AssignerSonatype
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 16:18:25 UTC
Updated2026-10-16 19:55:59 UTC
DescriptionSonatype Nexus Repository 3 allows an unauthenticated remote attacker to supply attacker-controlled input to a Java class loading call through an ExtDirect endpoint. This allows the attacker to learn whether specific classes are present in the application. The issue does not by itself allow code execution.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from 103e4ec9-0a87-450b-af77-479448ddef11

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.005510000 probability, percentile 0.448380000 (date 2026-10-16)

Problem Types: CWE-470 | CWE-470 CWE-470 Use of Externally-Controlled Input to Select Classes or Code ("Unsafe Reflection")

VersionSourceTypeScoreSeverityVector
4.0103e4ec9-0a87-450b-af77-479448ddef11Secondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sonatype Nexus Repository 3 affected 3.0.0 3.97.0 semver Not specified

References

ReferenceSourceLinkTags
help.sonatype.com/en/sonatype-nexus-repository-3-97-0-release-notes.html 103e4ec9-0a87-450b-af77-479448ddef11 help.sonatype.com
support.sonatype.com/hc/en-us/articles/56206649520147 103e4ec9-0a87-450b-af77-479448ddef11 support.sonatype.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: wupco123 (en)

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