CVE-2026-32284: The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (

Q: How do I fix CVE-2026-32284?

msgpack: upgrade to newer than 3.1.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-32284 being exploited?

CVE-2026-32284 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-32284 affect?

CVE-2026-32284 affects msgpack. Severity is high (CVSS 7.5). 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.

Q: How urgent is CVE-2026-32284?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-32284 is a high-severity flaw (CVSS 7.5) affecting msgpack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-03-26
Last modified	2026-10-07

Publisher (CNA): Go Project · Vendor: shamaton

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 20:16 UTCPublished CVE record published
2026-10-07 18:17 UTCUpdated Record last modified

shamaton msgpack UPGRADE

Affected: <= 3.1.2

Fixed in: newer than 3.1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy msgpack || rpm -q msgpack || msgpack --version

2. UPGRADE to newer than 3.1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade msgpack

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade msgpack

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-32284?

msgpack: upgrade to newer than 3.1.2. Exact commands for each OS are on this page.

Is CVE-2026-32284 being exploited?

CVE-2026-32284 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-32284 affect?

CVE-2026-32284 affects msgpack. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2026-32284?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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