Description
All versions of the package crow are vulnerable to HTTP Response Splitting when untrusted user input is used to build header values. Header values are not properly sanitized against CRLF Injection in the set_header and add_header functions. An attacker can add the \r\n (carriage return line feeds) characters to end the HTTP response headers and inject malicious content.
Affected products
crowcpp: crow
References4
- gist.github.com/dellalibera/9247769cc90ed96c0d72ddbcba88c65c ExploitThird Party Advisory
- gist.github.com/dellalibera/9247769cc90ed96c0d72ddbcba88c65c ExploitThird Party Advisory
- security.snyk.io/vuln/SNYK-UNMANAGED-CROW-5665556 Third Party Advisory
- security.snyk.io/vuln/SNYK-UNMANAGED-CROW-5665556 Third Party Advisory
Metrics
- CVSS 3.1
-
6.1
MEDIUM
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 1% percentile: 47 · as of 5 November 2026
- CWE
- CWE-113CWE-74
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.