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Vulnerabilities

Vulnerability · CVE-2026-6019

http.cookies.Morsel.js_output() returns an inline snippet and only escapes " for JavaScript string context.

Published Apr 22, 2026 · catalog updated Jul 27, 2026 · http.cookies.Morsel.js_output() returns an inline

Check if you run it

No confirmed exploitation is on record for CVE-2026-6019. EPSS is 0.21%. Act only if a listed version of http.cookies.Morsel.js_output() returns an inline is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (http.cookies.Morsel.js_output() returns an inline).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low2.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Advisory link
Affected products
cpe python/python

http.cookies.Morsel.js_output() 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe python/python3.15.0

How to fix CVE-2026-6019

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-6019. EPSS is 0.21%. Act only if a listed version of http.cookies.Morsel.js_output() returns an inline is installed.

Which versions are affected?

Compare what you have installed with 3.15.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-116; CWE-150. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 22, 2026 · NIST NVD

    Detected

    http.cookies.Morsel.js_output() 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.

  2. Jul 27, 2026 · NIST NVD

    Updated

    http.cookies.Morsel.js_output() 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.

Sources

  • CVE.orgVulnerability recordCVE-2026-6019

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-6019

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-6019

    http.cookies.Morsel.js_output() 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 esc

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.