CVE Database›Document archive›CVE-2026-1502

CVE-2026-1502

python: Python: HTTP header injection via CR/LF in proxy tunnel headers

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Severity

Moderate

Red Hat Product Security

4.5

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 · 4.5
CVSS: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')