CVE-2026-6019

N/A

Description

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

CVE Details

CVSS v3.1 ScoreN/A

Published4/22/2026

Last Modified4/22/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-150

References

https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104(cna@python.org)

https://github.com/python/cpython/issues/90309(cna@python.org)

https://github.com/python/cpython/pull/148848(cna@python.org)

https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/(cna@python.org)

IOC Correlations

No correlations recorded

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