Python Software Foundation up to 3.15.x Morsel http/cookies.py http.cookies.Morsel value input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.31+

Summaryinfo

A vulnerability marked as critical has been reported in Python Software Foundation Python up to 3.15.x. Impacted is the function http.cookies.Morsel of the file http/cookies.py of the component Morsel. Performing a manipulation of the argument Value results in input validation. This vulnerability is cataloged as CVE-2026-16052. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Python Software Foundation Python up to 3.15.x. This affects the function http.cookies.Morsel of the file http/cookies.py of the component Morsel. The manipulation of the argument value with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-16052 since 07/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.16.0 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Python 3.16.0

Timelineinfo

07/17/2026 CVE reserved
11/12/2026 +118 days Advisory disclosed
11/12/2026 +0 days VulDB entry created
11/12/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CNA: PSF
CVE: CVE-2026-16052 (🔒)

GCVE (CVE): GCVE-0-2026-16052
GCVE (VulDB): GCVE-100-436419

Entryinfo

Created: 11/12/2026 17:49
Changes: 11/12/2026 17:49 (71)
Complete: 🔍
Cache ID: 216::103

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