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Generated remediation guidance and an executive summary. No account required.
Envoy is a cloud-native, open source edge and service proxy. Prior to versions 1.30.4, 1.29.7, 1.28.5, and 1.27.7. Envoy references already freed memory when route hash policy is configured with cookie attributes. Note that this vulnerability has been fixed in the open as the effect would be immediately apparent if it was configured. Memory allocated for holding attribute values is freed after configuration was parsed. During request processing Envoy will attempt to copy content of de-allocated memory into request cookie header. This can lead to arbitrary content of Envoy's memory to be sent to the upstream service or abnormal process termination. This vulnerability is fixed in Envoy versions v1.30.4, v1.29.7, v1.28.5, and v1.27.7. As a workaround, do not use cookie attributes in route action hash policy.
Cite this page
CVE-2024-39305. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2024-39305
Use CWE-416, Envoyproxy vendor hub and Envoy product page to widen CVE-2024-39305 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-26308, CVE-2025-54588 and CVE-2025-62409 for nearby disclosures in the same product family.