SB2026020389 - Spoofing attack in Fastify
Published: February 3, 2026
Security Bulletin ID
SB2026020389
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Interpretation conflict (CVE-ID: CVE-2026-25223)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to improper input validation when handling "\t" characters. A remote attacker can bypass body validation checks set by the Content-Type header and perform spoofing attack.
Remediation
Install update from vendor's website.