CVE-2026-97666 Nexus Repository 3 - Unsafe Reflection in ExtDirect Repository Endpoint
Unauthenticated attackers can determine the presence of specific Java classes in Sonatype Nexus Repository 3 via unsafe reflection in the ExtDirect endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-97666?
CVE-2026-97666 is a medium-severity vulnerability in Sonatype Nexus Repository 3, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-470
Which versions are affected by CVE-2026-97666?
How do I fix CVE-2026-97666?
No fix has been published for CVE-2026-97666 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-97666 being exploited?
There is no known exploitation of CVE-2026-97666 in the wild and no public exploit code.
Sources
Also known as GHSA-rchx-54gw-m94r.