All vulnerabilities

Servers and applications

CVE-2021-23336

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…

Severity
Medium 5.9
Published
15 Feb 2021
Last changed
14 Oct 2026
Added to UpHeron
21 Oct 2026
Fixed in
3.6.13, 3.7.10, 3.8.8, 3.9.2
Sources
NVD

Affected software

SoftwareAffected versions
PythonServers and applications · cpe:a:python:python
  • Every version before 3.6.13
  • From 3.7.0 before 3.7.10
  • From 3.8.0 before 3.8.8
  • From 3.9.0 before 3.9.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-23336
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-23336