Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| envoyproxy | envoy | >= 1.36.0, <= 1.36.2, >= 1.35.0, <= 1.35.6, >= 1.34.0, <= 1.34.10, <= 1.33.12 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | ecs-service-connect-agent | v1.34.4.2-1.amzn2023 | ALAS2023-2025-1357 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/envoyproxy/envoy | >= 1.36.0, < 1.36.3 | 1.36.3 | GHSA-mp85-7mrq-r866 |
| Go | github.com/envoyproxy/envoy | >= 1.35.0, < 1.35.7 | 1.35.7 | GHSA-mp85-7mrq-r866 |
| Go | github.com/envoyproxy/envoy | >= 1.34.0, < 1.34.11 | 1.34.11 | GHSA-mp85-7mrq-r866 |
| Go | github.com/envoyproxy/envoy | < 1.33.13 | 1.33.13 | GHSA-mp85-7mrq-r866 |
Advisories 1
- ALAS2023-2025-1357 Important: ecs-service-connect-agent security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jan 7, 2026