All vulnerabilities

Servers and applications

CVE-2026-6019

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.

Severity
Low 2.1
Published
22 Apr 2026
Last changed
27 Jul 2026
Added to UpHeron
21 Oct 2026
Fixed in
3.13.14
Sources
NVD

Affected software

SoftwareAffected versions
PythonServers and applications · cpe:a:python:python
  • Version 3.15.0-alpha8
  • Version 3.15.0-alpha7
  • Version 3.15.0-alpha6
  • Version 3.15.0-alpha5
All 10 release lines
  • Every version before 3.13.14
  • From 3.14.0 up to 3.14.4
  • Version 3.15.0-alpha1
  • Version 3.15.0-alpha2
  • Version 3.15.0-alpha3
  • Version 3.15.0-alpha4
  • Version 3.15.0-alpha5
  • Version 3.15.0-alpha6
  • Version 3.15.0-alpha7
  • Version 3.15.0-alpha8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-6019
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6019