CVE catalog
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 of Service (ReDoS) attacks against
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 6.62% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | python | Not reported | Not reported | unknown |
| Cpe | python | Not reported | Not reported | unknown |
| Cpe | python | Not reported | Not reported | unknown |
| Cpe | python | Not reported | Not reported | unknown |
| Cpe | python | Not reported | Not reported | unknown |
| Cpe | leap | Not reported | Not reported | unknown |
| Cpe | ubuntu_linux | Not reported | Not reported | unknown |
| Cpe | ubuntu_linux | Not reported | Not reported | unknown |
| Cpe | ubuntu_linux | Not reported | Not reported | unknown |
| Cpe | ubuntu_linux | Not reported | Not reported | unknown |
| Cpe | ubuntu_linux | Not reported | Not reported | unknown |
| Cpe | ubuntu_linux | Not reported | Not reported | unknown |
| Cpe | fedora | Not reported | Not reported | unknown |
| Cpe | fedora | Not reported | Not reported | unknown |
| Cpe | debian_linux | Not reported | Not reported | unknown |
| Ubuntu | python2.7 | pro | 2.7.5-8ubuntu3 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.5-8ubuntu4 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-2 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-2ubuntu1 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-3 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-3ubuntu1 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-4 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-4ubuntu1 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-5 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-7 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-8 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-8ubuntu0.2 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-8ubuntu0.3 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-8ubuntu0.4 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-8ubuntu0.5 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-8ubuntu0.6+esm2 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-8ubuntu0.6+esm3 | vulnerable |
| Ubuntu | python2.7 | pro | 2.7.6-8ubuntu0.6+esm5 | fixed |
| Ubuntu | python3.4 | pro | 3.4~b1-0ubuntu3 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4~b1-4ubuntu4 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4~b1-4ubuntu6 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4~b1-5ubuntu2 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4~b2-1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4~b3-1ubuntu1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4~rc1-1build1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4~rc2-1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4~rc3-0ubuntu1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.0-1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.0-2ubuntu1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.0-2ubuntu1.1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.1 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.3 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.4 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.5 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.6 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.7 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.7+esm2 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.7+esm4 | vulnerable |
| Ubuntu | python3.4 | pro | 3.4.3-1ubuntu1~14.04.7+esm6 | fixed |
| Ubuntu | python3.5 | pro | 3.5.2-2ubuntu0~16.04.4~14.04.1 | vulnerable |
| Ubuntu | python3.5 | pro | 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1 | fixed |
| Ubuntu | python2.7 | 16.04 | 2.7.10-4ubuntu1 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.10-4ubuntu2 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.11-2 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.11-3 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.11-4 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.11-6 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.11-7 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.11-7ubuntu1 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.12-1~16.04 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.12-1ubuntu0~16.04.1 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.12-1ubuntu0~16.04.2 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.12-1ubuntu0~16.04.3 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.12-1ubuntu0~16.04.4 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.12-1ubuntu0~16.04.8 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.12-1ubuntu0~16.04.9 | vulnerable |
| Ubuntu | python2.7 | 16.04 | 2.7.12-1ubuntu0~16.04.11 | fixed |
| Ubuntu | python3.5 | 16.04 | 3.5.0-3 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.0-3ubuntu1 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1~rc1-2ubuntu1 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1-1 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1-2 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1-3 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1-5 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1-6ubuntu1 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1-6ubuntu2 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1-9ubuntu1 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.1-10 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2~16.01 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2~16.04 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2ubuntu0~16.04.1 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2ubuntu0~16.04.2 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2ubuntu0~16.04.3 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2ubuntu0~16.04.4 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2ubuntu0~16.04.5 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2ubuntu0~16.04.8 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2ubuntu0~16.04.9 | vulnerable |
| Ubuntu | python3.5 | 16.04 | 3.5.2-2ubuntu0~16.04.10 | fixed |
| Ubuntu | python2.7 | 18.04 | 2.7.14-2ubuntu2 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.14-4 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.14-6 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.14-7 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.14-8 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.15~rc1-1 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.15~rc1-1ubuntu0.1 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.15-4ubuntu4~18.04 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.15-4ubuntu4~18.04.1 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.15-4ubuntu4~18.04.2 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.17-1~18.04 | vulnerable |
| Ubuntu | python2.7 | 18.04 | 2.7.17-1~18.04ubuntu1 | fixed |
| Ubuntu | python3.6 | 18.04 | 3.6.3-1ubuntu1 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.4~rc1-1 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.4~rc1-2 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.4-1 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.4-2 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.4-3build1 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.4-4 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.5~rc1-1 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.5-3 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.6-1~18.04 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.7-1~18.04 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.8-1~18.04.1 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.8-1~18.04.2 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.8-1~18.04.3 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.9-1~18.04 | vulnerable |
| Ubuntu | python3.6 | 18.04 | 3.6.9-1~18.04ubuntu1 | fixed |
| Ubuntu | python3.7 | 18.04 | 3.7.0~a2-1 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0~a3-1 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0~a3-2 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0~a3-3 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0~a4-1 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0~b1-1 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0~b1-1build1 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0~b2-1 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0~b3-1 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.0-1~18.04 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.1-1~18.04 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.3-2~18.04.1 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.5-2~18.04 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.5-2~18.04.4 | vulnerable |
| Ubuntu | python3.7 | 18.04 | 3.7.5-2ubuntu1~18.04.2 | fixed |
| Ubuntu | python3.8 | 18.04 | 3.8.0-3~18.04 | vulnerable |
| Ubuntu | python3.8 | 18.04 | 3.8.0-3~18.04.1 | vulnerable |
| Ubuntu | python3.8 | 18.04 | 3.8.0-3ubuntu1~18.04.2 | fixed |
| Ubuntu | python2.7 | 20.04 | 2.7.17~rc1-1 | vulnerable |
| Ubuntu | python2.7 | 20.04 | 2.7.17-1 | vulnerable |
| Ubuntu | python2.7 | 20.04 | 2.7.17-1ubuntu5 | vulnerable |
| Ubuntu | python2.7 | 20.04 | 2.7.17-1ubuntu6 | vulnerable |
| Ubuntu | python2.7 | 20.04 | 2.7.18~rc1-2 | vulnerable |
| Ubuntu | python2.7 | 20.04 | 2.7.18-1~20.04 | vulnerable |
| Ubuntu | python2.7 | 20.04 | 2.7.18-1~20.04.1 | fixed |
| Ubuntu | python3.8 | 20.04 | 3.8.0-1 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.0-2 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.0-3 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.0-4 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.0-5 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.1-2ubuntu3 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.2~rc1-1ubuntu1 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.2-1 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.2-1ubuntu1 | vulnerable |
| Ubuntu | python3.8 | 20.04 | 3.8.2-1ubuntu1.1 | fixed |
| Alpine | python3 | 3.10 | 3.7.7-r0 | fixed |
| Alpine | python3 | 3.11 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.12 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.13 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.14 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.15 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.16 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.17 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.18 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.19 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.20 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.21 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.22 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.23 | 3.8.2-r0 | fixed |
| Alpine | python3 | 3.24 | 3.8.2-r0 | fixed |
| Debian | python2.7 | 11 | 2.7.18-2 | fixed |
| Suse | python | linux enterprise point of sale 11 sp3 | 2.6.9-40.35.2 | fixed |
| Suse | python-base | linux enterprise point of sale 11 sp3 | 2.6.9-40.35.1 | fixed |
| Suse | python-doc | linux enterprise point of sale 11 sp3 | 2.6-8.40.35.1 | fixed |
| Suse | python | linux enterprise server 11 sp4-ltss | 2.6.9-40.35.2 | fixed |
| Suse | python-base | linux enterprise server 11 sp4-ltss | 2.6.9-40.35.1 | fixed |
| Suse | python-doc | linux enterprise server 11 sp4-ltss | 2.6-8.40.35.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Ubuntu | python2.7 | deb | pro | 2.7.6-8ubuntu0.6+esm5 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python3.4 | deb | pro | 3.4.3-1ubuntu1~14.04.7+esm6 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python3.5 | deb | pro | 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python2.7 | deb | 16.04 | 2.7.12-1ubuntu0~16.04.11 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python3.5 | deb | 16.04 | 3.5.2-2ubuntu0~16.04.10 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python2.7 | deb | 18.04 | 2.7.17-1~18.04ubuntu1 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python3.6 | deb | 18.04 | 3.6.9-1~18.04ubuntu1 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python3.7 | deb | 18.04 | 3.7.5-2ubuntu1~18.04.2 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python3.8 | deb | 18.04 | 3.8.0-3ubuntu1~18.04.2 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python2.7 | deb | 20.04 | 2.7.18-1~20.04.1 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Ubuntu | python3.8 | deb | 20.04 | 3.8.2-1ubuntu1.1 | Not reported | UBUNTU-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.10 | 3.7.7-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.11 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.12 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.13 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.14 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.15 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.16 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.17 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.18 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.19 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.20 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.21 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.22 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.23 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Alpine | python3 | apk | 3.24 | 3.8.2-r0 | Not reported | ALPINE-CVE-2020-8492 | Not reported |
| Debian | python2.7 | deb | 11 | 2.7.18-2 | Not reported | DEBIAN-CVE-2020-8492 | Not reported |
| Suse | python | rpm | linux enterprise point of sale 11 sp3 | 2.6.9-40.35.2 | Not reported | SUSE-SU-2020:14306-1 | Not reported |
| Suse | python-base | rpm | linux enterprise point of sale 11 sp3 | 2.6.9-40.35.1 | Not reported | SUSE-SU-2020:14306-1 | Not reported |
| Suse | python-doc | rpm | linux enterprise point of sale 11 sp3 | 2.6-8.40.35.1 | Not reported | SUSE-SU-2020:14306-1 | Not reported |
| Suse | python | rpm | linux enterprise server 11 sp4-ltss | 2.6.9-40.35.2 | Not reported | SUSE-SU-2020:14306-1 | Not reported |
| Suse | python-base | rpm | linux enterprise server 11 sp4-ltss | 2.6.9-40.35.1 | Not reported | SUSE-SU-2020:14306-1 | Not reported |
| Suse | python-doc | rpm | linux enterprise server 11 sp4-ltss | 2.6-8.40.35.1 | Not reported | SUSE-SU-2020:14306-1 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-398330.json]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2020_3888.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2020-8492]
- [https://osv.dev/vulnerability/ALPINE-CVE-2020-8492]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-8492]
- [https://osv.dev/vulnerability/SUSE-SU-2020:14306-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-8492]
- [https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-8492.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2025-0227.json]
[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]