Out-of-bounds Write Affecting openshift-service-mesh/proxyv2-rhel9 package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.61% (47th percentile)

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  • Snyk IDSNYK-RHEL8-OPENSHIFTSERVICEMESHPROXYV2RHEL9-17810190
  • published3 Jul 2026
  • disclosed26 Jun 2026

Introduced: 26 Jun 2026

CVE-2026-48706  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 openshift-service-mesh/proxyv2-rhel9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openshift-service-mesh/proxyv2-rhel9 package and not the openshift-service-mesh/proxyv2-rhel9 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, a vulnerability exists in Envoy's TCP StatsD sink (TcpStatsdSink), where the thread-local flusher buffer can be overflowed by exceptionally long statistic names (e.g., >16KiB). During formatting, TcpStatsdSink reserves a single contiguous memory slice of 16KiB (FLUSH_SLICE_SIZE_BYTES). If formatting a single metric exceeds the remaining capacity, the flusher initiates a buffer rotation but incorrectly continues to allocate another fixed 16KiB slice. If an attacker can trigger a statistic name longer than 16KiB—for example, by sending an HTTP or gRPC request with an extremely long request path (:path) that is recorded by the grpc_stats filter configured with stats_for_all_methods: true—the flusher will attempt to copy the metric name using memcpy operations beyond the allocated heap buffer boundaries. This leads to a heap write overflow, which can cause immediate denial-of-service (process crash) or potential remote code execution (RCE). This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

CVSS Base Scores

version 3.1