CVE-2026-6019

Name: CVE-2026-6019
Creator: NVD / NIST
Published: 2026-04-22T20:16:42.617+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 2.1/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2026-6019 is a low-severity vulnerability rated 2.1/10 on the CVSS scale. 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS 4.0

2.1/10

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:X/V:X/RE:X/U:X

EPSS Probability

0.23%

13.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Python	Python	< 3.15.0

References

https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76cPatch
https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104Patch
https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8Patch
https://github.com/python/cpython/issues/90309Exploit, Issue Tracking
https://github.com/python/cpython/pull/148848Issue Tracking, Patch
https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/Mailing List, Vendor Advisory

Timeline

Published: Apr 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-6019?

How severe is CVE-2026-6019?

CVE-2026-6019 has a CVSS score of 2.1/10 (LOW severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2026-6019?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-6019?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST