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CVE-2026-26309

Envoy has an off-by-one write in JsonEscaper::escapeString() PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
envoyproxy / envoyaffected >= 1.37.0, < 1.37.1; affected >= 1.36.0, < 1.36.5; affected >= 1.35.0, < 1.35.9; affected < 1.34.13

CWE

CWE-193

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.