CVE-2026-26309— Envoy has an off-by-one write in JsonEscaper::escapeString()
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I. Basic Information for CVE-2026-26309
Vulnerability Information
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Vulnerability Title
Envoy has an off-by-one write in JsonEscaper::escapeString()
Source: NVD (National Vulnerability Database)
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, an off-by-one write in Envoy::JsonEscaper::escapeString() can corrupt std::string null-termination, causing undefined behavior and potentially leading to crashes or out-of-bounds reads when the resulting string is later treated as a C-string. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
Off-by-one错误
Source: NVD (National Vulnerability Database)
Vulnerability Title
Envoy 安全漏洞
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之前版本存在安全漏洞，该漏洞源于JsonEscaper::escapeString函数存在差一写入，可能导致崩溃或越界读取。
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-2026-26309
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|---|
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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-2026-26311 | 5.9 MEDIUM | Envoy HTTP: filter chain execution on reset streams causing UAF crash |
| 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
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Crash for scoped ip address in Envoy during DNS - CVE-2026-26308
Envoy has an RBAC Header Validation Bypass via Multi-Value H
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- CVE-2026-26330
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Crash for scoped ip address in Envoy during DNS - CVE-2026-26308
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