Resource Exhaustion Affecting python-httplib2 package, versions <0.20.2-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
3.63% (89th percentile)

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  • Snyk IDSNYK-ECHOLATEST-PYTHONHTTPLIB2-18828605
  • published15 Aug 2026
  • disclosed8 Feb 2021

Introduced: 8 Feb 2021

CVE-2021-21240  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade Echo:latest python-httplib2 to version 0.20.2-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-httplib2 package and not the python-httplib2 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1