ZeroDay Findings
Sign inSign up

Findings

CVE-2020-8492

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial o…

Published Jan 30, 2020 · updated Oct 14, 2026 · python python

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 30, 2020 · NIST NVD

    Detected

    Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

  2. Oct 14, 2026 · NIST NVD

    Updated

    Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Affected

  • cpe canonical/ubuntu linux12.04
  • cpe canonical/ubuntu linux14.04
  • cpe debian/debian linux9.0
  • cpe fedoraproject/fedora31
  • cpe opensuse/leap15.1
  • cpe python/pythonversion unspecified

Sources

  • CVE.orgCVE-2020-8492

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2020-8492

    30-day exploitation probability 6.6%

    first.org
  • NIST NVDCVE-2020-8492

    Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtr

    nvd.nist.gov

References