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MEDIUM severity

CVE-2020-35678 — autobahn

MEDIUMFix: crossbario/autobahn-python#1439

CVE-2020-35678 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in autobahn. A fix is available for autobahn — see the affected versions and patch details below.

Open Redirect in autobahn

Also known asGHSA-gwp7-vqr5-h33hPYSEC-2020-25
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk
0.00%0.65%1.30%1.94%0.3%1.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-35678 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍autobahn

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Autobahn|Python before 20.12.3 allows redirect header injection.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIautobahnall versions20.12.3pip install --upgrade 'autobahn==20.12.3'

Affected Products

1 product · 1 configurations
Application
autobahncrossbar
< 20.12.3
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for autobahn, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update autobahn to 20.12.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-35678 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

In Red Hat OpenStack Platform, because the flaw has a lower impact and the fix would require a substantial amount of development, no update will be provided at this time for the RHOSP python-autobahn package.

Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Source: Red Hat security advisory for CVE-2020-35678 (CC BY 4.0)
ProductFixed inAdvisory
Red Hat Ansible Tower 3.6 for RHEL 7ansible-tower-36/ansible-tower:3.6.7-1RHSA-2021:0778
Red Hat Ansible Tower 3.7 for RHEL 7ansible-tower-37/ansible-tower-rhel7:3.7.5-1RHSA-2021:0779
Red Hat Ansible Tower 3.8 for RHEL 7ansible-tower-38/ansible-runner-rhel7:1.4.7-1RHSA-2021:0780

Frequently Asked Questions

Autobahn|Python before 20.12.3 allows redirect header injection.
O3 Security · Impact-Aware SCA

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CVE-2020-35678: autobahn — Fixed in 20.12.3