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TI-2020-06815 Aliases CVE-2020-8492GHSA-wh3w-rqc7-4mpf

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…

Priority LOW 38CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 16 fixed, 5 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.06617 93rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 4 advisoriesRed Hat: 16 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 11

CPEVersionsRoleVendor
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*2.7.0 – 2.7.17; 3.5.0 – 3.5.9; 3.6.0 – 3.6.10; 3.7.0 – 3.7.6; 3.8.0 – 3.8.1Vulnerablepython-pillow
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:*:*:*:*12.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*19.10VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*20.04VulnerableCanonical
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*31VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*32VulnerableFedoraproject
  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Versions 2.7.0 – 2.7.17; 3.5.0 – 3.5.9; 3.6.0 – 3.6.10; 3.7.0 – 3.7.6; 3.8.0 – 3.8.1 Vulnerable ·python-pillow
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:*:*:*:* Versions 12.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* Versions 19.10 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical
  • cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
Show 1 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

Red Hat 4 advisories

  • RHSA-2020:4641 Released 2020-11-04 · Red Hat rating Moderate
    python38:3.8 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) Cython-0.29.14-4.module+el8.2.0+5234+f98739b6.src::python38:3.8, PyYAML-5.3.1-1.module+el8.3.0+7187+a27ec44b.src::python38:3.8, babel-2.7.0-10.module+el8.2.0+5234+f98739b6.src::python38:3.8 +47
  • RHSA-2020:4433 Released 2020-11-04 · Red Hat rating Moderate
    python3 security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 8) platform-python-3.6.8-31.el8, platform-python-debug-3.6.8-31.el8, platform-python-devel-3.6.8-31.el8 +3
    • Red Hat Enterprise Linux BaseOS (v. 8) platform-python-3.6.8-31.el8, python3-3.6.8-31.el8, python3-libs-3.6.8-31.el8 +1
  • RHSA-2020:4285 Released 2020-10-19 · Red Hat rating Moderate
    rh-python36 security, bug fix, and enhancement update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-python36-python-3.6.12-1.el6, rh-python36-python-debug-3.6.12-1.el6, rh-python36-python-devel-3.6.12-1.el6 +6
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-python36-python-3.6.12-1.el7, rh-python36-python-debug-3.6.12-1.el7, rh-python36-python-devel-3.6.12-1.el7 +6
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-python36-python-3.6.12-1.el7, rh-python36-python-debug-3.6.12-1.el7, rh-python36-python-devel-3.6.12-1.el7 +6
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-python36-python-3.6.12-1.el7, rh-python36-python-debug-3.6.12-1.el7, rh-python36-python-devel-3.6.12-1.el7 +6
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-python36-python-3.6.12-1.el6, rh-python36-python-debug-3.6.12-1.el6, rh-python36-python-devel-3.6.12-1.el6 +6
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-python36-python-3.6.12-1.el7, rh-python36-python-debug-3.6.12-1.el7, rh-python36-python-devel-3.6.12-1.el7 +6
Show 1 more Red Hat advisories
  • RHSA-2020:3888 Released 2020-09-29 · Red Hat rating Moderate
    python3 security update
    • Red Hat Enterprise Linux Client (v. 7) python3-3.6.8-17.el7, python3-libs-3.6.8-17.el7
    • Red Hat Enterprise Linux Client Optional (v. 7) python3-3.6.8-17.el7, python3-debug-3.6.8-17.el7, python3-devel-3.6.8-17.el7 +3
    • Red Hat Enterprise Linux ComputeNode (v. 7) python3-3.6.8-17.el7, python3-libs-3.6.8-17.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) python3-3.6.8-17.el7, python3-debug-3.6.8-17.el7, python3-devel-3.6.8-17.el7 +3
    • Red Hat Enterprise Linux Server (v. 7) python3-3.6.8-17.el7, python3-libs-3.6.8-17.el7, python3-libs-3.6.8-17.el7.ppc
    • Red Hat Enterprise Linux Server Optional (v. 7) python3-3.6.8-17.el7, python3-3.6.8-17.el7.ppc, python3-debug-3.6.8-17.el7 +9
    • Red Hat Enterprise Linux Workstation (v. 7) python3-3.6.8-17.el7, python3-libs-3.6.8-17.el7
    • Red Hat Enterprise Linux Workstation Optional (v. 7) python3-3.6.8-17.el7, python3-debug-3.6.8-17.el7, python3-devel-3.6.8-17.el7 +3

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 8AffectedNo fix planned: Will not fix
Red Hat Software CollectionsAffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:4433, RHSA-2020:4641
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2020:4433
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:3888
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:3888
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2020:3888
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2020:3888
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:3888
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:3888
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:3888
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:3888
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2020:4285
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4285
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2020:4285
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2020:4285
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2020:4285
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4285
Not affected: 2 products
  • Red Hat Enterprise Linux 8
  • Red Hat Software Collections

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-8492
  2. 2026-10-03 Alias added: GHSA-wh3w-rqc7-4mpf
  3. 2026-10-07 CVSS score added · CISA ADP
  4. 2026-10-07 Weakness changed · CISA ADP
  5. 2026-10-07 CISA SSVC decision points changed

References

Exploit 1

Patch 1

Advisory 11

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences