CVE-2026-26309

MEDIUM EPSS 28.4%
Published Mar 10, 20263mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Mar 10, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability Low

Threat Intelligence

EPSS Exploit Probability
28.4% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-193

Affected Products 4

VendorProductVersionRange
envoyproxyenvoy* <1.34.13
envoyproxyenvoy*≥1.35.0  –  <1.35.8
envoyproxyenvoy*≥1.36.0  –  <1.36.5
envoyproxyenvoy1.37.0any

References 1

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.