Out-of-Bounds Affecting envoyproxy/envoy package, versions [,1.36.10)[1.37.0,1.37.6)[1.38.0,1.38.4)[1.39.0,1.39.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ENVOYPROXYENVOY-20078979
- published24 Sept 2026
- disclosed26 Aug 2026
- creditUnknown
Introduced: 26 Aug 2026
CVE-2026-73549 (opens in a new tab)How to fix?
Upgrade envoyproxy/envoy to version 1.36.10, 1.37.6, 1.38.4, 1.39.1 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-Bounds in the handling of IPv6 addresses for HTTP/3 clients within original destination clusters. An attacker can cause a crash by sending specially crafted requests that trigger improper memory operations.