Milvus Proxy has Critical Authentication Bypass Vulnerability

Summary

Milvus is an open-source vector database built for generative AI applications. An unauthenticated attacker can exploit a vulnerability in versions prior to 2.4.24, 2.5.21, and 2.6.5 to bypass all authentication mechanisms in the Milvus Proxy component, gaining full administrative access to the Milvus cluster. This grants the attacker the ability to read, modify, or delete data, and to perform privileged administrative operations such as database or collection management. This issue has been fixed in Milvus 2.4.24, 2.5.21, and 2.6.5. If immediate upgrade is not possible, a temporary mitigation can be applied by removing the sourceID header from all incoming requests at the gateway, API gateway, or load balancer level before they reach the Milvus Proxy. This prevents attackers from exploiting the authentication bypass behavior.

Timeline

1. Nov 10, 2025, 10:05 PM UTCCVE published
2. Nov 12, 2025, 5:34 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: total

3. Nov 12, 2025, 8:13 PM UTCRecord last updated

Affected versions

• milvus-io milvus

  fixed in 2.4.24; From 2.5.0 · fixed in 2.5.21; From 2.6.0 · fixed in 2.6.5

• github.com/milvus-io/milvusGo

  From 0.10.4 · fixed in 2.4.24

• github.com/milvus-io/milvusGo

  From 2.5.0 · fixed in 2.5.21

• github.com/milvus-io/milvusGo

  From 2.6.0 · fixed in 2.6.5

• github.com/milvus-io/milvusGo

  fixed in 0.10.3-0.20251107071934-6102f001a971

• github.com/milvus-io/milvusGo

  fixed in 0.10.3-0.20251107071934-6102f001a971; From 0.10.4

References 6