{"id":"UBUNTU-CVE-2021-23336","details":"The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.","modified":"2026-07-27T21:00:22.625403586Z","published":"2021-02-15T13:15:00Z","related":["USN-4742-1"],"upstream":["CVE-2021-23336"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-23336"},{"type":"REPORT","url":"https://github.com/python/cpython/pull/24297"},{"type":"REPORT","url":"https://github.com/python/cpython/commit/fcbe0cb04d35189401c0c880ebfb4311e952d776"},{"type":"REPORT","url":"https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/"},{"type":"REPORT","url":"https://snyk.io/vuln/SNYK-UPSTREAM-PYTHONCPYTHON-1074933"},{"type":"REPORT","url":"https://www.djangoproject.com/weblog/2021/feb/19/security-releases/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4742-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-23336"}],"affected":[{"package":{"name":"python2.7","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/python2.7?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.5-8ubuntu3","2.7.5-8ubuntu4","2.7.6-2","2.7.6-2ubuntu1","2.7.6-3","2.7.6-3ubuntu1","2.7.6-4","2.7.6-4ubuntu1","2.7.6-5","2.7.6-7","2.7.6-8","2.7.6-8ubuntu0.2","2.7.6-8ubuntu0.3","2.7.6-8ubuntu0.4","2.7.6-8ubuntu0.5","2.7.6-8ubuntu0.6+esm2","2.7.6-8ubuntu0.6+esm3","2.7.6-8ubuntu0.6+esm5","2.7.6-8ubuntu0.6+esm6","2.7.6-8ubuntu0.6+esm7","2.7.6-8ubuntu0.6+esm8","2.7.6-8ubuntu0.6+esm9","2.7.6-8ubuntu0.6+esm10","2.7.6-8ubuntu0.6+esm11","2.7.6-8ubuntu0.6+esm12","2.7.6-8ubuntu0.6+esm13","2.7.6-8ubuntu0.6+esm14","2.7.6-8ubuntu0.6+esm15","2.7.6-8ubuntu0.6+esm16","2.7.6-8ubuntu0.6+esm17","2.7.6-8ubuntu0.6+esm18","2.7.6-8ubuntu0.6+esm20","2.7.6-8ubuntu0.6+esm21","2.7.6-8ubuntu0.6+esm22","2.7.6-8ubuntu0.6+esm24","2.7.6-8ubuntu0.6+esm25","2.7.6-8ubuntu0.6+esm26","2.7.6-8ubuntu0.6+esm28","2.7.6-8ubuntu0.6+esm29"],"ecosystem_specific":{"binaries":[{"binary_name":"idle-python2.7","binary_version":"2.7.6-8ubuntu0.6+esm29"},{"binary_name":"libpython2.7","binary_version":"2.7.6-8ubuntu0.6+esm29"},{"binary_name":"libpython2.7-minimal","binary_version":"2.7.6-8ubuntu0.6+esm29"},{"binary_name":"libpython2.7-stdlib","binary_version":"2.7.6-8ubuntu0.6+esm29"},{"binary_name":"libpython2.7-testsuite","binary_version":"2.7.6-8ubuntu0.6+esm29"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"python2.7"},{"binary_version":"2.7.6-8ubuntu0.6+esm29","binary_name":"python2.7-examples"},{"binary_name":"python2.7-minimal","binary_version":"2.7.6-8ubuntu0.6+esm29"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23336.json"}},{"package":{"name":"python3.4","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/python3.4?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4~b1-0ubuntu3","3.4~b1-4ubuntu4","3.4~b1-4ubuntu6","3.4~b1-5ubuntu2","3.4~b2-1","3.4~b3-1ubuntu1","3.4~rc1-1build1","3.4~rc2-1","3.4~rc3-0ubuntu1","3.4.0-1","3.4.0-2ubuntu1","3.4.0-2ubuntu1.1","3.4.3-1ubuntu1~14.04.1","3.4.3-1ubuntu1~14.04.3","3.4.3-1ubuntu1~14.04.4","3.4.3-1ubuntu1~14.04.5","3.4.3-1ubuntu1~14.04.6","3.4.3-1ubuntu1~14.04.7","3.4.3-1ubuntu1~14.04.7+esm2","3.4.3-1ubuntu1~14.04.7+esm4","3.4.3-1ubuntu1~14.04.7+esm6","3.4.3-1ubuntu1~14.04.7+esm7","3.4.3-1ubuntu1~14.04.7+esm8","3.4.3-1ubuntu1~14.04.7+esm10","3.4.3-1ubuntu1~14.04.7+esm11","3.4.3-1ubuntu1~14.04.7+esm12","3.4.3-1ubuntu1~14.04.7+esm13","3.4.3-1ubuntu1~14.04.7+esm14","3.4.3-1ubuntu1~14.04.7+esm15","3.4.3-1ubuntu1~14.04.7+esm16","3.4.3-1ubuntu1~14.04.7+esm17","3.4.3-1ubuntu1~14.04.7+esm19","3.4.3-1ubuntu1~14.04.7+esm20"],"ecosystem_specific":{"binaries":[{"binary_name":"idle-python3.4","binary_version":"3.4.3-1ubuntu1~14.04.7+esm20"},{"binary_name":"libpython3.4","binary_version":"3.4.3-1ubuntu1~14.04.7+esm20"},{"binary_version":"3.4.3-1ubuntu1~14.04.7+esm20","binary_name":"libpython3.4-minimal"},{"binary_version":"3.4.3-1ubuntu1~14.04.7+esm20","binary_name":"libpython3.4-stdlib"},{"binary_name":"libpython3.4-testsuite","binary_version":"3.4.3-1ubuntu1~14.04.7+esm20"},{"binary_version":"3.4.3-1ubuntu1~14.04.7+esm20","binary_name":"python3.4"},{"binary_name":"python3.4-examples","binary_version":"3.4.3-1ubuntu1~14.04.7+esm20"},{"binary_name":"python3.4-minimal","binary_version":"3.4.3-1ubuntu1~14.04.7+esm20"},{"binary_name":"python3.4-venv","binary_version":"3.4.3-1ubuntu1~14.04.7+esm20"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23336.json"}},{"package":{"name":"python3.5","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/python3.5?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5.2-2ubuntu0~16.04.4~14.04.1","3.5.2-2ubuntu0~16.04.4~14.04.1+esm1","3.5.2-2ubuntu0~16.04.4~14.04.1+esm3","3.5.2-2ubuntu0~16.04.4~14.04.1+esm4","3.5.2-2ubuntu0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