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Vulnerability record · CVE-2026-6019 · published 22 April 2026

CVE-2026-6019: Python vulnerability

Python · Python

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.

2.1 CVSS 4.0 Low EPSS 0.21% · top 88.6% CWE-150 · CWE-150CWE-116 · CWE-116
2.1CVSS 4.0 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References, 1 tagged exploit
10 Nov 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c Patch
https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104 Patch
https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8 Patch
https://github.com/python/cpython/issues/90309 ExploitIssue Tracking
https://github.com/python/cpython/pull/148848 Issue TrackingPatch
https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/ Mailing ListVendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-6019), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.