CVE-2026-1502
python: Python: HTTP header injection via CR/LF in proxy tunnel headers
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 11, 2026
Updated · August 25, 2026
Description
A flaw was found in Python. This vulnerability allows for the injection of extra information into HTTP communication. Specifically, the system does not properly prevent special characters (carriage return and line feed) from being included in HTTP client proxy tunnel headers or host fields.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVSS / CWE
CVSS 3.1 · 4.5CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
CWE-93 · Improper Neutralization of CRLF Sequences ('CRLF Injection')