Detections
Analytics
CVE-2026-26309
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.
References
https://docs.cloud.google.com/support/bulletins/index#gcp-2026-013
https://github.com/envoyproxy/envoy/security/advisories/GHSA-56cj-wgg3-x943