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5.9 Medium

CVE-2026-26311 Envoy is a high-performance edge/middle/service proxy

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, a logic vulnerability in Envoy's HTTP connection manager (FilterManager) that allows for Zombie Stream Filter Execution. This issue creates a "Use-After-Free" (UAF) or state-corruption window where filter callbacks are invoked on an HTTP stream that has already been logically reset and cleaned up. The vulnerability resides in source/common/http/filter_manager.cc within the FilterManager::decodeData method. The ActiveStream object remains valid in memory during the deferred deletion window. If a DATA frame arrives on this stream immediately after the reset (e.g., in the same packet processing cycle), the HTTP/2 codec invokes ActiveStream::decodeData, which cascades to FilterManager::decodeData. FilterManager::decodeData fails to check the saw_downstream_reset_ flag. It iterates over the decoder_filters_ list and invokes decodeData() on filters that have already received onDestroy(). This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.

Affected products and versions

Product Affected versions Fixed in
envoy 1.37 1.37.0 → < 1.37.1 1.37.1
envoy 1.36 1.36.0 → < 1.36.5 1.36.5
envoy 1.35 1.35.0 → < 1.35.9 1.35.9
envoy 1.34 earliest → < 1.34.13 1.34.13

References

Timeline

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