python: Python: Cross-Site Scripting (XSS) vulnerability in http.cookies module

A flaw was found in Python's http.cookies module. The Morsel.jsoutput function, responsible for generating JavaScript output for cookies, does not properly neutralize the HTML sequence. This oversight could allow a remote attacker to inject malicious script into a web page, potentially leading to...

PSF-2026-21

http.cookies.Morsel.jsoutput returns an inline snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value...

CVE-2026-6019 BaseCookie.js_output() does not neutralize embedded characters

http.cookies.Morsel.jsoutput returns an inline snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value...