Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-26309

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 0.1%
CVSS Severity
CVSS v3 Score 5.3
Products affected by CVE-2026-26309


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