HTTP Request Smuggling Affecting envoyproxy/envoy package, versions [1.35.0,1.35.13)[1.36.0,1.36.9)[1.37.0,1.37.5)[1.38.0,1.38.3)
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-17661088
- published28 Jun 2026
- disclosed26 Jun 2026
- creditUnknown
Introduced: 26 Jun 2026
CVE-2026-48743 (opens in a new tab)How to fix?
Upgrade envoyproxy/envoy to version 1.35.13, 1.36.9, 1.37.5, 1.38.3 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling in the translation process from HTTP/3 to HTTP/1 when handling requests with a nonzero Content-Length header and no body. An attacker can bypass routing controls or cause request desynchronization by sending specially crafted HTTP/3 requests that exploit the mismatch between the declared content length and the actual request body.