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Fencer Vulns
high 7.5

CVE-2026-32284 json

Denial of service in github.com/shamaton/msgpack

published 2026-03-16 7 mo ago modified 2026-10-07 32 d ago also GHSA-h9q6-hc68-35rp , GO-2026-4513 , GO-2026-4740 , EUVD-2026-16343

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 36%
public exploits
0
none known

Summary

The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.

Patch / fix

  • go github.com/shamaton/msgpack/v2 2.4.1
  • go github.com/shamaton/msgpack/v3 3.1.1
  • github.com/shamaton/msgpack/v2 github.com/shamaton/msgpack/v2 2.4.1
  • github.com/shamaton/msgpack/v3 github.com/shamaton/msgpack/v3 3.1.1
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2

suse advisories SUSE-SU-2026:1135-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

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-2026-32284 updated cvss 5.9

github.com/shamaton/msgpack: msgpack: Denial of Service via truncated fixext data

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9, openshift-logging/fluentd-rhel9, openshift-logging/eventrouter-rhel9, openshift-logging/logging-view-plugin-rhel9, openshift-logging/cluster-logging-rhel9-operator, openshift-logging/log-file-metric-exporter-rhel9, +1 more Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9 Red Hat 3scale API Management Platform 2 3scale-amp21/zync, 3scale-amp22/zync, 3scale-amp24/zync, 3scale-amp25/zync, 3scale-amp26/zync, 3scale-amp20/system, +11 more Red Hat AI Inference Server rhaiis/vllm-tpu-rhel9, rhaiis/vllm-cuda-rhel9, rhaiis/vllm-rocm-rhel9, rhaiis/vllm-spyre-rhel9, rhaiis-preview/vllm-cuda-rhel9 Red Hat Ansible Automation Platform 2 automation-controller, ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-26/controller-rhel9, ansible-automation-platform-26/eda-controller-rhel9, ansible-automation-platform/automation-dashboard-rhel9, ansible-automation-platform-26/lightspeed-chatbot-rhel9, +1 more Red Hat Enterprise Linux 7 firefox
    +1 more products
    Red Hat Enterprise Linux 8 firefox, thunderbird, python3.11-pip, python3.12-pip, python3.11-pip-wheel, python3.12-pip-wheel
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 firefox, fence-virt, python-pip, fence-virtd, firefox-x11, python3-pip, +63 more
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 firefox, python-pip, thunderbird, python3.14-pip Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9, rhelai3/bootc-azure-rocm-rhel9 Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-cuda-rhel9, rhoai/odh-vllm-rocm-rhel9, rhoai/odh-vllm-gaudi-rhel9, rhoai/odh-kserve-agent-rhel9, rhoai/odh-kserve-router-rhel9, rhoai/odh-kserve-controller-rhel9, +20 more Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9 Red Hat Satellite 6 satellite/iop-puptoo-rhel9, satellite/iop-yuptoo-rhel9, satellite/iop-advisor-engine-rhel9, satellite/iop-insights-engine-rhel9, satellite/iop-vulnerability-engine-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images golang1.25, golang1.26
    not affected: component 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
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • securityinfinity.com https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

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

Affected packages

ecosystem package affected fixed in
go github.com/shamaton/msgpack/v2
<=2.4.0
<2.4.1
2.4.1
go github.com/shamaton/msgpack/v3
<=3.1.0
<3.1.1
3.1.1
go github.com/shamaton/msgpack
all versions
 no fix listed

Affected products

  • github.com/shamaton/msgpack github.com/shamaton/msgpack
  • github.com/shamaton/msgpack/v2 github.com/shamaton/msgpack/v2
  • github.com/shamaton/msgpack/v3 github.com/shamaton/msgpack/v3

Classification

Weakness

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.