CVE-2026-6019
LOWDescription
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.
How to fix
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 14% of all known CVEs.
References
Related Vulnerabilities
Other CWE-150 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2017-0899 | Critical | 9.8 | 11% | - | Fix |
| CVE-2025-55754 | Critical | 9.6 | 10% | - | Fix |
| CVE-2021-25310 | High | 8.8 | 4.6% | - | - |
| CVE-2020-6932 | Critical | 10.0 | 3.6% | - | - |
| CVE-2024-28085 | Low | 3.3 | 2.2% | - | Fix |
| CVE-2022-30123 | Critical | 10.0 | 1.9% | - | Fix |
Common questions
How do I fix CVE-2026-6019?
Published advisories record a fix for 123 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-6019 being actively exploited?
Not that we know of. CVE-2026-6019 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.23% is the estimated probability that it will be exploited in the next 30 days. That is higher than 14% of all scored CVEs.
How severe is CVE-2026-6019?
CVE-2026-6019 has a CVSS v3 base score of 6.1, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-6019 affect?
Published advisories record a fix for python (Amazon), python-debug (Amazon), python-debuginfo (Amazon), python-devel (Amazon), and 119 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-27.