CVE-2026-26330
MEDIUM
GHSA-c23c-rp3m-vpg3
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2Tags
Description
Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, At the rate limit filter, if the response phase limit with apply_on_stream_done in the rate limit configuration is enabled and the response phase limit request fails directly, it may crash Envoy. When both the request phase limit and response phase limit are enabled, the safe gRPC client instance will be re-used for both the request phase request and response phase request. But after the request phase request is done, the inner state of the request phase limit request in gRPC client is not cleaned up. When a second limit request is sent at response phase, and the second limit request fails directly, the previous request's inner state may be accessed and result in crash. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
Analysis
Envoy proxy versions prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13 can be crashed by an authenticated attacker through improper state cleanup in the rate limit filter when both request and response phase limiting are enabled. When a response phase rate limit request fails, the gRPC client reuses stale internal state from the prior request phase, leading to a use-after-free condition that crashes the proxy. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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