envoyproxy envoy up to 1.35.10/1.36.6/1.37.2/1.38.0 incorrect operator

Summaryinfo

A vulnerability labeled as problematic has been found in envoyproxy envoy up to 1.35.10/1.36.6/1.37.2/1.38.0. Affected by this issue is some unknown functionality. Such manipulation leads to incorrect operator. This vulnerability is uniquely identified as CVE-2026-48497. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in envoyproxy envoy up to 1.35.10/1.36.6/1.37.2/1.38.0 and classified as problematic. Affected by this issue is an unknown part. The manipulation with an unknown input leads to a incorrect operator vulnerability. Using CWE to declare the problem leads to CWE-480. The product accidentally uses the wrong operator, which changes the logic in security-relevant ways. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-48497 since 05/21/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 1.35.11, 1.36.7, 1.37.3 or 1.38.1 eliminates this vulnerability.

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Productinfo

Type

• Firewall Software

Vendor

• envoyproxy

Name

• envoy

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.35.0
• 1.35.1
• 1.35.2
• 1.35.3
• 1.35.4
• 1.35.5
• 1.35.6
• 1.35.7
• 1.35.8
• 1.35.9
• 1.35.10
• 1.36
• 1.36.0
• 1.36.1
• 1.36.2
• 1.36.3
• 1.36.4
• 1.36.5
• 1.36.6
• 1.37
• 1.37.0
• 1.37.1
• 1.37.2
• 1.38.0

License

• free

Website

• Product: https://github.com/envoyproxy/envoy/

CPE 2.3info

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CPE 2.2info

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