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Memory Leak Affecting kuma-envoy-1.38 package, versions <1.38.4-r0

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.55% (45th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-KUMAENVOY138-20268528
  • published30 Sept 2026
  • disclosed21 Sept 2026
Report a new vulnerability Found a mistake?

Introduced: 21 Sep 2026

NewCVE-2026-73550  (opens in a new tab)
CWE-401  (opens in a new tab)

How to fix?

Upgrade Minimos:latest kuma-envoy-1.38 to version 1.38.4-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kuma-envoy-1.38 package and not the kuma-envoy-1.38 package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy copies every decoded HTTP/2 Host header value before discarding it when :authority is already present. The discarded value bypasses saveHeader, so its bytes and count are not charged against request header limits. An unauthenticated client can use HPACK indexing to submit many references to a large Host value across a bounded number of streams, forcing extreme header-copy allocation and causing the proxy to be out-of-memory killed. The relevant scope boundary is that the demonstrated amplification uses HTTP/2 HPACK and the duplicate Host discard behavior. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.