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    <lastBuildDate>Mon, 05 Oct 2026 20:18:06 +0000</lastBuildDate>
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      <title>CVE-2026-26311 — Envoy HTTP: filter chain execution on reset streams causing UAF crash</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-26311</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; envoyproxy envoy&lt;/p&gt;
&lt;p&gt;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&amp;#39;s HTTP connection manager (FilterManager) that allows for Zombie Stream Filter Execution. This issue creates a &amp;#34;Use-After-Free&amp;#34; (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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; envoyproxy envoy&lt;/p&gt;
&lt;p&gt;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&amp;#39;s HTTP connection manager (FilterManager) that allows for Zombie Stream Filter Execution. This issue creates a &amp;#34;Use-After-Free&amp;#34; (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.&lt;/p&gt;</content:encoded>
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