Nexus Repository - Arbitrary Class Instantiation via Unsafe Realm Configuration

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-17593
StatePUBLISHED
AssignerSonatype
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-07 17:16:59 UTC
Updated2026-08-07 19:17:38 UTC
DescriptionAn account holding the nexus:settings:update permission in Nexus Repository 3 (or the equivalent nexus:settings permission in the legacy Nexus Repository 2) could submit arbitrary values as realm identifiers through an internal configuration API that did not validate them against the set of registered realms. Because unrecognized entries were persisted and re-evaluated on every realm load via a legacy code path, this could result in unintended code executing inside the Nexus Repository process, and in some cases a persistent authentication lockout that was not visible through the administrative UI.

Risk And Classification

Primary CVSS: v4.0 7.2 HIGH from 103e4ec9-0a87-450b-af77-479448ddef11

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/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

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-af77-479448ddef11Secondary7.2HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS7.2HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

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

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/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 affected 2.8.0 3.95.0 semver Not specified

References

ReferenceSourceLinkTags
support.sonatype.com/hc/en-us/articles/53849535836179 103e4ec9-0a87-450b-af77-479448ddef11 support.sonatype.com
help.sonatype.com/en/sonatype-nexus-repository-3-95-0-release-notes.html 103e4ec9-0a87-450b-af77-479448ddef11 help.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: Mayur Udiniya aka roughwire (https://x.com/roughwire/) (en)

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