CVE-2026-0672 is a medium-severity vulnerability associated with Python's http.cookies.Morsel component. This vulnerability allows user-controlled cookie values and parameters to inject HTTP headers into messages, which can lead to serious security implications. The vulnerability has a CVSS score of 6, indicating a medium level of risk. Organizations utilizing affected versions of Python should prioritize addressing this vulnerability to mitigate the associated risks.
The potential for HTTP header injection can enable attackers to manipulate responses and conduct various attacks, such as cross-site scripting or session fixation. Organizations should be aware of the urgency of this vulnerability and consider it in their security planning and patching cycles.
Currently, the vulnerability status is 'Awaiting Analysis,' and there is no known public exploit. However, it is crucial for defenders to take proactive measures to secure their systems, as the implications of such vulnerabilities can be severe.
Organizations should prioritize patching immediately to prevent any potential exploitation. Implementing the patch that rejects all control characters within cookie names, values, and parameters is a necessary step in mitigating this vulnerability.
Vulnerability Details
The vulnerability affects the http.cookies.Morsel component, where user-controlled cookie values and parameters can lead to HTTP header injection. The description provided indicates that a patch has been developed to reject control characters within cookie names, values, and parameters, addressing the vulnerability effectively.
The publication date of this CVE is January 20, 2026, and it has been classified under CWE-93. The vulnerability is categorized as having a CVSS score of 6, which reflects its medium severity level.
Technical Analysis
The root cause of CVE-2026-0672 stems from insufficient validation of user-controlled cookie values, allowing attackers to inject HTTP headers. The attack vector is network-based, with a low attack complexity. Attackers require low privileges, and no user interaction is necessary for exploitation.
The vulnerability's confidentiality impact is low, while the integrity impact is high, indicating that it can lead to significant data manipulation. The availability impact is none, meaning that the vulnerability does not directly affect service uptime.
Risk & Impact Analysis
The risk to organizations includes potential HTTP header injection, which can compromise the integrity of web applications and lead to other attacks. The blast radius for this vulnerability can be considerable if left unaddressed, affecting users and organizational data.
Given the CVSS score of 6, organizations should address this vulnerability in their priority patch cycle. It is essential to evaluate the deployment of affected Python versions and implement necessary mitigations promptly.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
As the specific affected versions are not detailed in the CVE data, it is recommended that organizations consider all versions of Python prior to the patch release to be potentially vulnerable.
Mitigation & Remediation
To address CVE-2026-0672, organizations should apply the available patch that rejects all control characters within cookie names, values, and parameters. It is critical to review the implementation of http.cookies.Morsel in applications and ensure compliance with the updated security measures.
For organizations unable to immediately apply the patch, implementing input validation mechanisms to sanitize cookie values can serve as a temporary workaround. Additionally, organizations should enhance their monitoring of cookie handling within applications to detect any potentially malicious activity.
Organizations can further strengthen their defenses by considering continuous security testing practices to identify vulnerabilities proactively.
Detection Guidance
Security teams should monitor log files for unusual cookie values that may indicate injection attempts. Behavioral anomalies, such as unexpected HTTP responses or headers, should be flagged for investigation.
Implementing network signatures to detect malicious traffic patterns targeting cookie handling can also aid in identifying attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
CVE-2026-0672 highlights an important aspect of application security related to cookie handling. As organizations increasingly rely on web applications, vulnerabilities in cookie management can lead to significant security risks. This incident emphasizes the need for robust input validation and the importance of addressing potential weaknesses in components like http.cookies.Morsel.
Security teams should take this opportunity to review their web application security practices and ensure that cookie handling mechanisms are secure. Additionally, continuous security assessments, such as continuous security testing, can help identify similar vulnerabilities in other components.
Ultimately, this vulnerability serves as a reminder of the importance of maintaining a proactive security posture. Organizations that prioritize timely patching and rigorous testing will be better equipped to defend against exploitation attempts.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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