Stack-based buffer overflow in envoy - CVE-2026-48042
Published: June 24, 2026
Vulnerability identifier: #VU135111
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-48042
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cloud Native Computing Foundation
Affected software:
envoy
envoy
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in the JSON Object destructor when processing deeply nested JSON input. A remote attacker can send a specially crafted JSON string to cause a denial of service.
The issue is triggered after successful parsing when the resulting object graph is destroyed, and affects uses of the loadFromString method.
How to mitigate CVE-2026-48042
Install security update from vendor's website.