CVE-2016-7036: python-jose failure to use a constant time comparison for HMAC keys
Summary
CVE-2016-7036: python-jose failure to use a constant time comparison for HMAC keys. Affects python-jose versions < 1.3.2. Fixed in 1.3.2. How to fix ↓
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Background
python-jose is a Python library that provides a way to encode, decode, sign, and verify JSON Web Tokens (JWTs). It is commonly used for implementing authentication and authorization mechanisms in web applications. The library allows developers to work with JWTs easily and securely. However, a vulnerability has been discovered in python-jose versions before 1.3.2, which could have unspecified impacts on the application's security. The vulnerability arises from the failure to use a constant time comparison for HMAC keys.
Vulnerability Detail
The vulnerability in python-jose before version 1.3.2 stems from the lack of constant time comparison for HMAC keys. This can be exploited by attackers to potentially compromise the security of the application. By leveraging this vulnerability, an attacker could perform various malicious activities, such as bypassing authentication mechanisms, forging tokens, or gaining unauthorized access to sensitive data. The exact impact of the vulnerability may vary depending on the specific implementation and usage of python-jose in the application.
How To Fix
Latest published version: 3.5.0 as of 22 Oct 2026
pip install --upgrade "python-jose==3.5.0"Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
1.3.2
This is the first release that contains the fix.
pip install --upgrade "python-jose==1.3.2"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is crucial to update python-jose to the fixed version as soon as possible to mitigate the risk of exploitation.
Conclusion
In conclusion, python-jose versions before 1.3.2 are vulnerable to a critical security issue that could have unspecified impacts on the application's security. It is crucial to update python-jose to version 1.3.2 or later to mitigate the risk of exploitation. Failure to address this vulnerability could lead to unauthorized access, token forgery, or bypassing authentication mechanisms. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
python-jose is a Python library used for working with JSON Web Tokens (JWTs). It provides functionality for encoding, decoding, signing, and verifying JWTs.
The impact of this vulnerability can vary depending on the specific implementation and usage of python-jose. However, it could potentially lead to unauthorized access, token forgery, or bypassing authentication mechanisms.
To fix this vulnerability, it is recommended to upgrade python-jose to version 1.3.2 or later. This version includes the necessary fix to ensure constant time comparison for HMAC keys.
There is no known workaround for this vulnerability. It is crucial to update python-jose to the fixed version as soon as possible.
You can find more information about this vulnerability in the official GitHub advisory: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-w799-prg3-cx77/GHSA-w799-prg3-cx77.json
References
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