Use After Free 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
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-15466972
- published12 Mar 2026
- disclosed10 Mar 2026
- creditUnknown
Introduced: 10 Mar 2026
CVE-2026-26311 (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 Use After Free in the FilterManager::decodeData process. An attacker can trigger a crash or cause denial of service by sending a DATA frame to an HTTP stream immediately after it has been reset, leading to execution of filter callbacks on already destroyed objects.