CVE-2026-54345Public exploitNetwork attack vector

Remote collector crash via AVP length underflow

Published Jul 28, 2026 · Updated Jul 28, 2026

Integer underflow in gopacket 1.6.0 and earlier allows remote attackers to crash Diameter collectors with crafted AVP lengths. The decodeDiameterAVP function accepts vendor-flagged lengths of 8 through 11 despite a 12-byte header, subtracts in uint32, and passes the wrapped result to make. Any service that parses attacker-delivered Diameter data reaches the allocation without authentication; repeated messages can OOM-kill its process.

CVSS severity6.9
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in gopacket 1.6.0 and earlier allows remote attackers to crash Diameter collectors with crafted AVP lengths. The decodeDiameterAVP function accepts vendor-flagged lengths of 8 through 11 despite a 12-byte header, subtracts in uint32, and passes the wrapped result to make. Any service that parses attacker-delivered Diameter data reaches the allocation without authentication; repeated messages can OOM-kill its process.

The record

CVE
CVE-2026-54345
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
Go standard library
Product
gopacket
Classifications
CWE-191, CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=< 1.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · gopacketversion=< 1.6.1

Published CVSS scores

6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
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 exploitPublished

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

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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