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  4. CVE 2026 6019 basecookiejsoutput does not neutralize embedded
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Back to active CVEs
Low · CVSS 2.1CVE-2026-6019

BaseCookie.js_output() does not neutralize embedded charactersCVE-2026-6019

Answer in brief

CVE-2026-6019 records a Low severity (CVSS 2.1) vulnerability in BaseCookie.js_output() does not neutralize embedded characters. The current sources do not mark it as known exploited. The current feed maps Python Software Foundation/CPython (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 22, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Oct 28, 2026Material review Nov 10, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 2.1
Exploitation
Not marked as known exploited
Affected software
15 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 2.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Python Software Foundation/CPython (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:python:python:3.15.0:alpha8:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Python Software Foundation/CPythongeneric>=0 <3.13.14 || >=3.14.0a1 <3.14.5rc1 || >=3.15.0a1 <3.15.0b13.13.14, 3.14.5rc1, 3.15.0b1
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)generic>=V3.1.7 <**
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)generic>=V3.1.7 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)generic>=V3.1.7 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)generic>=V3.1.7 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)generic>=V3.1.7 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Python Software Foundation/CPython, Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0).
  2. 2Review the reported fix. Update Python Software Foundation/CPython to 3.13.14; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) to *; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 28, 2026

Sources and claim methodology

  • Source referencecert-portal.siemens.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencemail.python.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-150, CWE-116
Source
CVE List V5
Source checked
Nov 10, 2026
References
7 linked sources
Open source record