UDP DNS Filter Vulnerability in Envoy Proxy by Envoy Proxy
CVE-2026-48497

5.9MEDIUM

Key Information:

Vendor

Envoyproxy

Status
Envoy
Vendor
CVE Published:
26 June 2026

What is CVE-2026-48497?

Envoy Proxy, an open-source edge and service proxy, contains a vulnerability when the UDP DNS filter is configured. Specifically, if local or remote DNS resolution is set up for a name with a length of 255 octets, it can lead to abnormal process termination. This occurs because the runtime condition checks incorrectly enforce that query names must be less than 255 octets, which contradicts the DNS specification outlined in RFC 1035. The issue is addressed in Envoy Proxy versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1.

Affected Version(s)

envoy >= 1.38.0, < 1.38.1 < 1.38.0, 1.38.1

envoy >= 1.37.0, < 1.37.3 < 1.37.0, 1.37.3

envoy >= 1.36.0, < 1.36.7 < 1.36.0, 1.36.7

References

https://github.com/envoyproxy/envoy/security/advisories/G...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.