Incorrect Authorization Affecting envoyproxy/envoy package, versions [,1.34.13)[1.35.0,1.35.9)[1.36.0,1.36.5)[1.37.0,1.37.1)
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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- published12 Mar 2026
- disclosed10 Mar 2026
- creditUnknown
Introduced: 10 Mar 2026
CVE-2026-26308 (opens in a new tab)How to fix?
Upgrade envoyproxy/envoy to version 1.34.13, 1.35.9, 1.36.5, 1.37.1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Authorization in the RBAC filter's handling of HTTP headers when multiple values are present for the same header name. An attacker can bypass access control policies by sending duplicate headers, causing the system to concatenate values and obscure malicious content from exact-match checks.