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Fencer Vulns
high 7.5

CVE-2026-65819 json

gopacket: Multiple layer decoders panic on crafted packets (out-of-bounds/underflow) enabling unauthenticated remote DoS via DecodingLayerParser

published 2026-08-07 3 mo ago modified 2026-09-09 1 mo ago also EUVD-2026-54609

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

gopacket provides packet processing capabilities for Go. Through version 1.7.0, multiple layer decoders use attacker-controlled lengths, counts, or offsets before validating them against packet buffers, allowing a crafted packet decoded through DecodingLayerParser or DecodeFromBytes to trigger an unrecovered panic and remotely deny service. A patch commit is available at 210f25f.

Patch / fix

  • telegraf Azure Linux 3.0 1.31.0-31

azure linux advisories AZL-95490

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-65819 updated cvss 7.5

github.com/gopacket/gopacket: gopacket: Remote Denial of Service via crafted packet processing

  • Red Hat Network Observability Operator network-observability/network-observability-ebpf-agent-rhel9
    affected: workaround, no fix available
  • Red Hat Network Observability (NETOBSERV) 1.12.3 network-observability/network-observability-cli-rhel9 1789986279
    fixed: vendor fix RHSA-2026:70593
  • Red Hat Network Observability (NETOBSERV) 1.12.3 network-observability/network-observability-rhel9-operator 1789979117, network-observability/network-observability-operator-bundle 1789980334, network-observability/network-observability-ebpf-agent-rhel9 1789978991, network-observability/network-observability-console-plugin-rhel9 1789978277, network-observability/network-observability-flowlogs-pipeline-rhel9 1789978651, network-observability/network-observability-console-plugin-pf4-rhel9 1789978275, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • gopacket gopacket

Classification

Weakness
  • CWE-125 Out-of-bounds Read
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.