SB2026022407 - Denial of service in nats-server
Published: February 24, 2026
Security Bulletin ID
SB2026022407
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2026-27571)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input when WebSockets handling the NATS messages. A remote attacker can use a compression bomb to cause excessive memory consumption and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.