Vulnerability DatabaseCVE-2026-16052
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CVE-2026-16052
Published:November 12, 2026
Updated:November 13, 2026
The http.cookies.Morsel class allows separator semicolons in attribute values and includes them verbatim in all output formats. An attacker who can control these values could use this to relax the cookie's Domain or SameSite restrictions.
Related Resources (6)
https://mail.python.org/archives/list/security-announce@python.org/thread/IZL4QUFV7PKGT2JYSU2DCBMLTWYJDGKZ/
https://github.com/python/cpython
https://github.com/python/cpython/pull/161711
https://github.com/python/cpython/issues/161707
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16052.json
https://nvd.nist.gov/vuln/detail/CVE-2026-16052
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CVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Special Elements in Output Used by a Downstream Component
CWE-74
EPSS
Base Score:
0.30