Vulnerability in Python Software Foundation Cpython

CVE-2026-0672

When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters.

Vulnerability class: CRLF Injection

EPSS: 0.004 (32.8th percentile) — read the EPSS interpretation.

Affected products

Weakness classification (CWE)

References