CVE-2025-54588: Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults

September 15, 2025

A use-after-free (UAF) vulnerability in Envoy’s DNS cache causes abnormal process termination. Envoy may reallocate memory when processing a pending DNS resolution, causing list iterator to reference freed memory.

References

github.com/advisories/GHSA-g9vw-6pvx-7gmw
github.com/envoyproxy/envoy
github.com/envoyproxy/envoy/releases/tag/v1.34.5
github.com/envoyproxy/envoy/releases/tag/v1.35.1
github.com/envoyproxy/envoy/security/advisories/GHSA-g9vw-6pvx-7gmw
nvd.nist.gov/vuln/detail/CVE-2025-54588

Code Behaviors & Features

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