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Not in CISA KEV
HIGH severity

MessagePack for Golang subject to DoS via Unmarshal panicGHSA-jr77-8gx4-h5qh

HIGHFix: shamaton/msgpack#32

GHSA-jr77-8gx4-h5qh is a high-severity (CVSS 7.5) vulnerability in github.com/shamaton/msgpack/v2. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for github.com/shamaton/msgpack/v2 — see the affected versions and patch details below.

Also known asCVE-2022-41719GO-2022-0972
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-jr77-8gx4-h5qh.

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs66th percentile — riskier than 66% of all scored CVEsHighest risk
0.00%0.54%1.09%1.63%0.3%1.1%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹github.com/shamaton/msgpack/v2

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Unmarshal can panic on some inputs, possibly allowing for denial of service attacks. This issue has been patched in version 2.1.1.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/shamaton/msgpack/v2all versions2.1.1go get github.com/shamaton/msgpack/v2@v2.1.1

Affected Products

1 product · 1 configurations
Application
messagepackmessagepack_project
< 2.1.1
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Unmarshal can panic on some inputs, possibly allowing for denial of serv…

github.comNVDNov 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/shamaton/msgpack/v2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/shamaton/msgpack/v2 to 2.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-jr77-8gx4-h5qh is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

Unmarshal can panic on some inputs, possibly allowing for denial of service attacks. This issue has been patched in version 2.1.1.
O3 Security · Impact-Aware SCA

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MessagePack for Golang subject to DoS via Unmarshal…