Heap-based buffer overflow in envoy - CVE-2026-48706
Published: June 24, 2026
Vulnerability identifier: #VU135105
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-48706
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cloud Native Computing Foundation
Affected software:
envoy
envoy
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in TcpStatsdSink when processing exceptionally long statistic names. A remote attacker can send an HTTP or gRPC request with an extremely long request path that is recorded in a statistic name to cause a denial of service or execute arbitrary code.
Only deployments using a TCP-based StatsD sink and emitting client-influenced dynamic statistics are vulnerable, such as when the grpc_stats filter is configured with stats_for_all_methods: true.
How to mitigate CVE-2026-48706
Install security update from vendor's website.