CVE-2021-21240

HIGH7.5

Regular Expression Denial of Service in httplib2

Published Feb 8, 2021

Modified 1 years ago

Details

httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of "\xa0" characters in the "www-authenticate" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.

References

WEB

https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc

WEB

https://github.com/httplib2/httplib2/pull/182

WEB

https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m

WEB

https://pypi.org/project/httplib2

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2021-21240

CVSS Analysis