What’s Vulnerable › Vulnerabilities

CVE-2023-47090

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-30 · updated 2026-06-17
• Weakness: CWE-863

Description

NATS nats-server before 2.9.23 and 2.10.x before 2.10.2 has an authentication bypass. An implicit $G user in an authorization block can sometimes be used for unauthenticated access, even when the intention of the configuration was for each user to have an account. The earliest affected version is 2.2.0.

Affected products

• nats-io nats-server: from 2.2.0 before 2.9.23; from 2.10.0 before 2.10.2 — fixed in 2.10.2, 2.9.23

How to fix

Upgrade to a fixed version: nats-io nats-server 2.10.2, 2.9.23. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2023/10/30/1
• https://github.com/nats-io/nats-server/security/advisories/GHSA-fr2g-9hjm-wr23
• https://www.openwall.com/lists/oss-security/2023/10/13/2
• http://www.openwall.com/lists/oss-security/2023/10/30/1
• https://github.com/nats-io/nats-server/security/advisories/GHSA-fr2g-9hjm-wr23
• https://www.openwall.com/lists/oss-security/2023/10/13/2

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