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CVE-2026-26311— Envoy HTTP: filter chain execution on reset streams causing UAF crash

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.37.1之前版本、1.36.5之前版本、1.35.8之前版本和1.34.13之前版本存在资源管理错误漏洞，该漏洞源于HTTP连接管理器逻辑缺陷，可能导致释放后重用或状态损坏。

CVSS 5.9 · Medium EPSS 0.48% · P39
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I. Basic Information for CVE-2026-26311

Vulnerability Information
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Vulnerability Title
Envoy HTTP: filter chain execution on reset streams causing UAF crash
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.37.1之前版本、1.36.5之前版本、1.35.8之前版本和1.34.13之前版本存在资源管理错误漏洞，该漏洞源于HTTP连接管理器逻辑缺陷，可能导致释放后重用或状态损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.37.0, < 1.37.1 -

II. Public POCs for CVE-2026-26311

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III. Intelligence Information for CVE-2026-26311

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Vendor Advisories for CVE-2026-26311 (1)

Same Patch Batch · envoyproxy · 2026-03-10 · 5 CVEs total

CVE-2026-26308 7.5 HIGH Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation
CVE-2026-26310 5.9 MEDIUM Crash for scoped ip address in Envoy during DNS
CVE-2026-26309 5.3 MEDIUM Envoy has an off-by-one write in JsonEscaper::escapeString()
CVE-2026-26330 5.3 MEDIUM Envoy global rate limit may crash when the response phase limit is enabled and the respons

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-416

V. Comments for CVE-2026-26311

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