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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.

PUBLISHED Reserved 2026-02-13 | Published 2026-03-10 | Updated 2026-03-10 | Assigner GitHub_M




MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-193: Off-by-one Error

Product status

>= 1.37.0, < 1.37.1
affected

>= 1.36.0, < 1.36.5
affected

>= 1.35.0, < 1.35.9
affected

< 1.34.13
affected

References

github.com/.../envoy/security/advisories/GHSA-56cj-wgg3-x943

cve.org (CVE-2026-26309)

nvd.nist.gov (CVE-2026-26309)

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