CVE-2026-48706Network attack vector

Process crash via oversized StatsD metric name

Published Jun 26, 2026 · Updated Jun 26, 2026

Heap buffer overflow in affected Envoy releases allows remote attackers to crash the proxy through oversized TCP StatsD metric names. TcpStatsdSink reserves fixed 16 KiB flush slices, rotates when a formatted metric will not fit, then copies an overlong name beyond the new heap allocation. Exploitation requires a TCP StatsD sink and client-influenced dynamic metric names, such as grpc_stats with stats_for_all_methods enabled; the documented consequence is a process crash.

CVSS severity5.9
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in affected Envoy releases allows remote attackers to crash the proxy through oversized TCP StatsD metric names. TcpStatsdSink reserves fixed 16 KiB flush slices, rotates when a formatted metric will not fit, then copies an overlong name beyond the new heap allocation. Exploitation requires a TCP StatsD sink and client-influenced dynamic metric names, such as grpc_stats with stats_for_all_methods enabled; the documented consequence is a process crash.

The record

CVE
CVE-2026-48706
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.34.0, < 1.35.13
  2. Affected versionversion=>= 1.36.0, < 1.36.9
  3. Affected versionversion=>= 1.37.0, < 1.37.5
  4. Affected versionversion=>= 1.38.0, < 1.38.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Envoy Proxy · Envoyversion=>= 1.34.0, < 1.35.13; version=>= 1.36.0, < 1.36.9; version=>= 1.37.0, < 1.37.5; version=>= 1.38.0, < 1.38.3

Published CVSS scores

5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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