SB2026010581 - CRLF injection in cpp-httplib
Published: January 5, 2026
Security Bulletin ID
SB2026010581
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) CRLF injection (CVE-ID: CVE-2026-21428)
The vulnerability allows a remote attacker to inject arbitrary HTTP headers.
The vulnerability exists due to insufficient validation of attacker-supplied data. A remote attacker can send a specially crafted HTTP request to the application containing CR-LF characters and modify application behavior. When combined with a server that supports http1.1 pipelining this can be used for server side request forgery attacks.
Remediation
Install update from vendor's website.