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High, CVSS 7.5

Denial of service in github.com/shamaton/msgpack

CVE-2026-32284GHSA-h9q6-hc68-35rp

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go github.com/shamaton/msgpack/v2

    Affected
    <= 2.4.0
    Fixed in
    no fixed version recorded

  • Go github.com/shamaton/msgpack/v3

    Affected
    <= 3.1.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-32284: 0.42% estimated exploitation activity in the next 30 days; percentile 36.46 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-h9q6-hc68-35rp

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-32284

Advisory: Denial of service in github.com/shamaton/msgpack
IDs: CVE-2026-32284, GHSA-h9q6-hc68-35rp
Record: https://patchnext.com/advisories/cve-2026-32284 (revision 1, source checked 26 Oct 2026, 15:19 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/shamaton/msgpack/v2: affected <= 2.4.0
- Go github.com/shamaton/msgpack/v3: affected <= 3.1.0

## Suggested inspection (read-only)
- Go github.com/shamaton/msgpack/v2: check the installed version with your package manager.
- Go github.com/shamaton/msgpack/v3: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/shamaton/msgpack/v2, github.com/shamaton/msgpack/v3.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-h9q6-hc68-35rp (GitHub-reviewed advisory GHSA-h9q6-hc68-35rp lists affected ranges: Go github.com/shamaton/msgpack/v2 >=0 =0 <=3.1.0)

Commands are suggestions: review each one before running it.

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