Vulnerability Description
The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code. NOTE: a third party indicates that exploitation is extremely unlikely unless the machine is already compromised; in other cases, the attacker would be unable to write their payload to the cache and generate the required collision
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Flask-Caching Project | Flask-Caching | <= 1.10.1 |
Related Weaknesses (CWE)
References
- https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937Issue TrackingPatchThird Party Advisory
- https://github.com/sh4nks/flask-caching/pull/209PatchThird Party Advisory
- https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937Issue TrackingPatchThird Party Advisory
- https://github.com/sh4nks/flask-caching/pull/209PatchThird Party Advisory
FAQ
What is CVE-2021-33026?
CVE-2021-33026 is a vulnerability with a CVSS score of 9.8 (CRITICAL). The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache sto...
How severe is CVE-2021-33026?
CVE-2021-33026 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-33026?
Check the references section above for vendor advisories and patch information. Affected products include: Flask-Caching Project Flask-Caching.