CVE-2026-48497

Envoy: Abnormal process termination in DNS UDP filter

State: Published
Severity: 5.9 Medium
Published: Jun 26, 2026
Updated: Jun 26, 2026
Reserved: May 21, 2026

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, in cases where UDP DNS filter is configured with local resolution containing a name with the length of 255 octets or remote resolution for a name of 255 octets long can complete successfully, a query with such name will result in abnormal process termination. The abnormal process termination is triggered by an invalid runtime precondition that the query name is strictly less than 255 octets, contradicting DNS specification rfc1035#section-2.3.4 that the name can be 255 or less octets. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-480 Use of Incorrect Operator

Affected Products

Product	Versions
envoyenvoyproxy	>= 1.38.0, < 1.38.1Affected >= 1.37.0, < 1.37.3Affected >= 1.36.0, < 1.36.7Affected < 1.35.11Affected

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-j6g2-wf95-q66q

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