CVE-2024-23326: Envoy incorrectly accepts HTTP 200 response for entering upgrade mode

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-04 · updated 2026-06-17
Weakness: CWE-391

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

envoyproxy envoy: before 1.27.6; from 1.28.0 before 1.28.4; from 1.29.0 before 1.29.5; from 1.30.0 before 1.30.2 — fixed in 1.27.6, 1.28.4, 1.29.5, 1.30.2

How to fix

Upgrade to a fixed version: envoyproxy envoy 1.27.6, 1.28.4, 1.29.5, 1.30.2. Check the vendor advisory for mitigations.

References

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