Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.

Related CVEs

CVE-2019-16254

Key Information

GHSA ID

GHSA-w9fp-2996-hhwx

Published

May 24, 2022 5:02 PM

Last Modified

May 1, 2023 12:30 AM

CVSS Score

5.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 28, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.