CVE-2025-64763: Envoy forwards early CONNECT data in TCP proxy mode

CVE-2025-64763 · Severity: low · CVSS 3.1 · Published 2025-12-05

Envoy forwards early CONNECT data in TCP proxy mode

Technologies: github.com/envoyproxy/envoy (Go). Vendors: Go.

Quick answers

Is CVE-2025-64763 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-64763 being exploited in the wild.
How severe is CVE-2025-64763?
Low severity, with a CVSS score of 3.1, published 5 December 2025.
Which products and versions are affected?
github.com/envoyproxy/envoy (Go) SEMVER:introduced=1.36.0,fixed=1.36.3.
Is there a fix for CVE-2025-64763?
Yes. github.com/envoyproxy/envoy (Go): upgrade to 1.36.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-64763?
Check whether you run github.com/envoyproxy/envoy (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/envoyproxy/envoy (Go): upgrade to 1.36.3 or later
    go get github.com/envoyproxy/envoy@v1.36.3

Affected products

  • github.com/envoyproxy/envoy (Go) SEMVER:introduced=1.36.0,fixed=1.36.3

Identifiers

  • CVE-2025-64763
  • GHSA-rj35-4m94-77jh

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