CVE-2026-26309

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

En bref

Sévérité: MEDIUM 5.3
EPSS: EPSS 0.39 % · centile 33 (2026-10-27)
État: PUBLISHED
Publiée: 2026-03-10
Mise à jour: 2026-03-10
Attribuée par: GitHub_M
Statut NVD: Analyzed

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.

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	MEDIUM 5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	GitHub_M
CVSS 3.1	MEDIUM 5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	MEDIUM 5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	NVD · nvd@nist.gov (Primary)

Faiblesses (CWE)

CWE-193

Avis

GHSA-56cj-wgg3-x943 — Envoy affected by off-by-one write in JsonEscaper::escapeString()

Références européennes

ENISA EUVD · EUVD-2026-10800
GCVE · GCVE-0-2026-26309

Configurations affectées (CPE NVD)

cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* < 1.34.13
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* ≥ 1.35.0 < 1.35.8
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* ≥ 1.36.0 < 1.36.5
cpe:2.3:a:envoyproxy:envoy:1.37.0:*:*:*:*:*:*:*

Produits affectés

Produit	Versions
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

Références

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

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD