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5.9 Medium

CVE-2024-23326 Envoy is a cloud-native, open source edge and service proxy

Description

Envoy is a cloud-native, open source edge and service proxy. A theoretical request smuggling vulnerability exists through Envoy if a server can be tricked into adding an upgrade header into a response. Per RFC https://www.rfc-editor.org/rfc/rfc7230#section-6.7 a server sends 101 when switching protocols. Envoy incorrectly accepts a 200 response from a server when requesting a protocol upgrade, but 200 does not indicate protocol switch. This opens up the possibility of request smuggling through Envoy if the server can be tricked into adding the upgrade header to the response.

Affected products and versions

Product Affected versions Fixed in
envoy 1.29 1.29.0 → 1.29.4 No fix stated
envoy 1.28 1.28.0 → 1.28.3 No fix stated
envoy 1.27 earliest → 1.27.5 No fix stated
envoy 1.13 1.13.0 → 1.30.1 No fix stated

References

Timeline

  1. Published
  2. Last modified

Other CVEs of envoy

The 98 CVEs of envoy →
CVE-2026-73511 Envoy is an open source edge and service proxy designed for cloud-native applications 5.3 Medium CVE-2026-73553 Envoy is an open source edge and service proxy designed for cloud-native applications 7.5 High CVE-2026-73551 Envoy is an open source edge and service proxy designed for cloud-native applications 5.3 Medium CVE-2026-73546 Envoy is an open source edge and service proxy designed for cloud-native applications 7.4 High
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