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A specially crafted argument to the idna.encode() function could consume significant resources. This may lead to a denial-of-service.
The function has been refined to reject such strings without the associated resource consumption in version 3.7.
Domain names cannot exceed 253 characters in length, if this length limit is enforced prior to passing the domain to the idna.encode() function it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.
A specially crafted argument to the idna.encode() function could consume significant resources. This may lead to a denial-of-service.
The function has been refined to reject such strings without the associated resource consumption in version 3.7.
Domain names cannot exceed 253 characters in length, if this length limit is enforced prior to passing the domain to the idna.encode() function it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.
This medium-severity vulnerability could be exploited under certain conditions to compromise security controls or access sensitive information. Should be addressed in a timely manner.
Probability of exploitation in the next 30 days · more likely than 71.4% of all CVEs.
Apply security patches to version 3.7 immediately
Isolate affected systems from untrusted networks until patching is complete
Implement enhanced monitoring for exploitation attempts and unusual behavior