CVE-2025-64527: Envoy crashes when JWT authentication is configured with the remote JWKS fetching

December 5, 2025

Envoy crashes when JWT authentication is configured with the remote JWKS fetching, allow_missing_or_failed is enabled, multiple JWT tokens are present in the request headers and the JWKS fetch fails.

References

github.com/advisories/GHSA-mp85-7mrq-r866
github.com/envoyproxy/envoy
github.com/envoyproxy/envoy/security/advisories/GHSA-mp85-7mrq-r866
nvd.nist.gov/vuln/detail/CVE-2025-64527

Code Behaviors & Features

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