CVE-2026-34457
OAuth2 Proxy's Health Check User-Agent Matching Bypasses Authentication in auth_request Mode
Severity by source
Trivy's own label is CRITICAL. Rated critical by GHSA, Bitnami.
Description
OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 contain a configuration-dependent authentication bypass in deployments where OAuth2 Proxy is used with an auth_request-style integration (such as nginx auth_request) and either --ping-user-agent is set or --gcp-healthchecks is enabled. In affected configurations, OAuth2 Proxy treats any request with the configured health check User-Agent value as a successful health check regardless of the requested path, allowing an unauthenticated remote attacker to bypass authentication and access protected upstream resources. Deployments that do not use auth_request-style subrequests or that do not enable --ping-user-agent/--gcp-healthchecks are not affected. This issue is fixed in 7.15.2.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| bitnami::Bitnami Vulnerability Database | oauth2-proxy | 7.15.2 |
| go::GitHub Security Advisory Go | github.com/oauth2-proxy/oauth2-proxy, github.com/oauth2-proxy/oauth2-proxy/v7 | 7.15.2 |
| minimos | oauth2-proxy, oauth2-proxy-fips | 7.15.2-r0 |
Show all 5 entries from 3 sources
| Source | Package | Fixed in |
|---|---|---|
| bitnami::Bitnami Vulnerability Database | oauth2-proxy | 7.15.2 |
| go::GitHub Security Advisory Go | github.com/oauth2-proxy/oauth2-proxy | no fix listed |
| go::GitHub Security Advisory Go | github.com/oauth2-proxy/oauth2-proxy/v7 | 7.15.2 |
| minimos | oauth2-proxy | 7.15.2-r0 |
| minimos | oauth2-proxy-fips | 7.15.2-r0 |