CVE-2026-6019

LOW EPSS 13.6%
Published Apr 22, 20262mo ago · Modified Jun 17, 20262w ago
2.1 CVSS 4.0
Low
Find Similar
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
2.1
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
13.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-116
CWE-150

Affected Products 1

VendorProductVersionRange
pythonpython* <3.15.0

References 6

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

Remediation

  • github.com https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c
    Patch
  • github.com https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104
    Patch
  • github.com https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8
    Patch
  • github.com https://github.com/python/cpython/pull/148848
    Issue TrackingPatch