oauth2 proxy vulnerabilities and fixes

Recent CVEs affecting oauth2 proxy, with upgrade or downgrade steps. 5 tracked.

Also searched as: oauth2proxy.

oauth2 proxy has 5 tracked vulnerabilities, 2 critical. A fixed release or vendor patch exists for 5. Most recent: 2026-04-22. Highest priority: CVE-2026-34457 (score 47/100).

• CVE-2026-34457 CRITICAL 9.1 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
• CVE-2026-34454 LOW 3.5 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
• CVE-2026-40575 CRITICAL 9.1 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
• CVE-2026-41059 HIGH 8.2 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
• CVE-2026-40574 MEDIUM 6.8 UPGRADE OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers

FAQ

How do I fix oauth2 proxy vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is oauth2 proxy being exploited right now?

None of the tracked oauth2 proxy CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which oauth2 proxy CVE should I patch first?

CVE-2026-34457 currently ranks highest (47/100): OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers.

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