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CVE-2025-64527
Good to know:
Date: December 3, 2025
Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, 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. This is caused by a re-entry bug in the JwksFetcherImpl. When the first token's JWKS fetch fails, onJwksError() callback triggers processing of the second token, which calls fetch() again on the same fetcher object. The original callback's reset() then clears the second fetch's state (receiver_ and request_) which causes a crash when the async HTTP response arrives.
Severity Score
Severity Score
Weakness Type (CWE)
NULL Pointer Dereference
CWE-476Top Fix
Upgrade Version
Upgrade to version github.com/envoyproxy/envoy - v1.36.3;github.com/envoyproxy/envoy - v1.35.7;github.com/envoyproxy/envoy - v1.34.11;github.com/envoyproxy/envoy - v1.33.13;https://github.com/envoyproxy/envoy.git - v1.36.3;https://github.com/envoyproxy/envoy.git - v1.35.7;https://github.com/envoyproxy/envoy.git - v1.34.11;https://github.com/envoyproxy/envoy.git - v1.33.13
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | LOW |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | NONE |
| Availability (A): | HIGH |