Vulnerability · Published Oct 15, 2026 · Assigned by Sonatype
CVE-2026-97666Nexus Repository 3 - Unsafe Reflection in ExtDirect Repository Endpoint
Medium 6.9
In plain English
A medium-severity security flaw in Nexus Repository 3 from Sonatype. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).
Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.6%top 50.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Sonatype 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Sonatype | Nexus Repository 3 | 3.0.0 – before 3.97.0 |
Weakness: CWE-470 · Vector: 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