Use of incorrect operator in envoy - CVE-2026-48497
Published: June 24, 2026
Vulnerability identifier: #VU135118
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-48497
CWE-ID: CWE-480
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use of incorrect operator in DNS UDP filter when processing a DNS query containing a name 255 octets long. A remote attacker can send a specially crafted DNS query to cause a denial of service.
Exploitation requires that the DNS filter successfully resolve the queried name.
Affected software
envoy
How to mitigate CVE-2026-48497
Install security update from vendor's website.
envoy - addressed in versions 1.35.12, 1.36.8, 1.37.4, 1.38.2