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CVE-2026-26309

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CVE-2026-26309

Published: Mar 10, 2026

Modified: Mar 10, 2026

PUBLISHED

CVSS v3.1

5.3

MEDIUM

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.

VendorProductVersions

envoyproxy

envoy

affected
>= 1.37.0, < 1.37.1
affected
>= 1.36.0, < 1.36.5
affected
>= 1.35.0, < 1.35.9
affected
< 1.34.13

Weaknesses (CWE)

CWE-193

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

References

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