Name: CVE-2026-6019: Improper Neutralization of Escape, Meta, or Control Sequences
Creator: Rapid7
Published: 2026-04-22T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-6019, CWE-150, CWE-116, CVSS 6.1, EPSS 0.00211

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 Details

CVSS 4.0 Base Score: 2.1 (LOW)
CVSS 4.0 Vector: (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)
CVSS 3.1 Base Score: 6.1
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade python3.14-tkinterUpgrade python3.14-freethreading-tkinterUpgrade python3.14-freethreadingUpgrade python3.14-freethreading-idleUpgrade python3.14-debugUpgrade python3.14-freethreading-libsUpgrade python3.14-testUpgrade python3.14Upgrade python3.14-idleUpgrade python3.14-freethreading-debugUpgrade python3.14-freethreading-testUpgrade python3.14-develUpgrade python3.14-libsUpgrade python3.14-freethreading-devel	Jun 25, 2026	Jun 23, 2026
Amazon Linux Ami 2	—	Upgrade tkinterUpgrade python3Upgrade python3-testUpgrade python-testUpgrade python-debuginfoUpgrade python3-debugUpgrade python-develUpgrade python3-libsUpgrade python3-debuginfoUpgrade python-toolsUpgrade python-libsUpgrade python-debugUpgrade python3-tkinterUpgrade python3-develUpgrade pythonUpgrade python3-tools	Jun 23, 2026	Jun 23, 2026
Amazon_linux_2023	—	Upgrade python3.9-debuginfoUpgrade python3.13-freethreading-debugUpgrade python3-libsUpgrade python3-idleUpgrade python3.13-debugUpgrade python-unversioned-commandUpgrade python3.13-debugsourceUpgrade python3.13-testUpgrade python3.13-tkinterUpgrade python3.13-idleUpgrade python3.13-develUpgrade python3-develUpgrade python3.9-debugsourceUpgrade python3-tkinterUpgrade python3-testUpgrade python3.13Upgrade python3.13-freethreadingUpgrade python3.13-debuginfoUpgrade python3-debugUpgrade python3Upgrade python3.13-libs	Jun 9, 2026	Apr 22, 2026
Debian	—	Upgrade python3.13Upgrade python3.11	Jul 23, 2026	Apr 22, 2026
Redhat_linux	—	Upgrade python3.14-freethreading-tkinterUpgrade python3.14-freethreading-idleUpgrade python3.14-debuginfoNo solution existsUpgrade python3.14-debugUpgrade python3.14-freethreading-testUpgrade python3.14-debugsourceUpgrade python3.14-freethreadingUpgrade python3.14Upgrade python3.14-idleUpgrade python3.14-freethreading-libsUpgrade python3.14-tkinterUpgrade python3.14-freethreading-debugUpgrade python3.14-libsUpgrade python3.14-develUpgrade python3.14-freethreading-develUpgrade python3.14-test	Jun 25, 2026	Apr 22, 2026
Rocky_linux	—	Upgrade python3.14-debugUpgrade python3.14-debugsourceUpgrade python3.14-testUpgrade python3.14-freethreading-testUpgrade python3.14-freethreading-libsUpgrade python3.14-tkinterUpgrade python3.14-debuginfoUpgrade python3.14-freethreading-idleUpgrade python3.14-freethreadingUpgrade python3.14-develUpgrade python3.14-freethreading-tkinterUpgrade python3.14-idleUpgrade python3.14-freethreading-debugUpgrade python3.14-freethreading-develUpgrade python3.14-libsUpgrade python3.14	Jun 29, 2026	Jun 27, 2026
Ubuntu	—	Upgrade libpython3.5 (Ubuntu Pro)Upgrade python3.7 (Ubuntu Pro)Upgrade libpython3.4 (Ubuntu Pro)Upgrade python3.10Upgrade python3.9 (Ubuntu Pro)Upgrade python3.14Upgrade libpython3.12t64Upgrade libpython3.7 (Ubuntu Pro)Upgrade python3.5 (Ubuntu Pro)Upgrade libpython3.14Upgrade libpython3.6 (Ubuntu Pro)Upgrade python2.7 (Ubuntu Pro)Upgrade libpython3.10Upgrade python3.12Upgrade python3.4 (Ubuntu Pro)Upgrade python3.11 (Ubuntu Pro)Upgrade python3.6 (Ubuntu Pro)Upgrade python3.8 (Ubuntu Pro)Upgrade libpython2.7 (Ubuntu Pro)Upgrade libpython3.11 (Ubuntu Pro)Upgrade libpython3.9 (Ubuntu Pro)Upgrade libpython3.8 (Ubuntu Pro)	Jul 6, 2026	Apr 22, 2026
Vmware Photon_os	—	Use 'tdnf update' to upgrade all packages to the latest version.	Jun 5, 2026	Apr 22, 2026

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CVSS Details

Covered by Rapid7

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