Denial of service in github.com/shamaton/msgpack
Priority HIGH 72CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 13 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-125 and the CVSS impact.
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00421 36th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial github.com/shamaton/msgpack/v2 (github.com/shamaton/msgpack/v2): 2.4.1github.com/shamaton/msgpack/v3 (github.com/shamaton/msgpack/v3): 3.1.1Red Hat: 13 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| github.com/shamaton/msgpack | github.com/shamaton/msgpack | — | — | No fix listed | CNA |
| github.com/shamaton/msgpack/v2 | github.com/shamaton/msgpack/v2 | before 2.4.1 | 2.4.1 | Patch available | CNA |
| github.com/shamaton/msgpack/v3 | github.com/shamaton/msgpack/v3 | before 3.1.1 | 3.1.1 | Patch available | CNA |
| — | github.com/shamaton/msgpack/v2 (Go) | up to 2.4.0 | — | No fix listed | GHSA-h9q6-hc68-35rp |
| — | github.com/shamaton/msgpack/v3 (Go) | up to 3.1.0 | — | No fix listed | GHSA-h9q6-hc68-35rp |
- github.com/shamaton/msgpack Vendorgithub.com/shamaton/msgpack Affected — Fixed in — No fix listed CNA
- github.com/shamaton/msgpack/v2 Vendorgithub.com/shamaton/msgpack/v2 Affected before 2.4.1 Fixed in 2.4.1 Patch available CNA
- github.com/shamaton/msgpack/v3 Vendorgithub.com/shamaton/msgpack/v3 Affected before 3.1.1 Fixed in 3.1.1 Patch available CNA
- github.com/shamaton/msgpack/v2 (Go) Vendor— Affected up to 2.4.0 Fixed in — No fix listed GHSA-h9q6-hc68-35rp
- github.com/shamaton/msgpack/v3 (Go) Vendor— Affected up to 3.1.0 Fixed in — No fix listed GHSA-h9q6-hc68-35rp
Remediation
- Fix · CNA github.com/shamaton/msgpack/v2 (github.com/shamaton/msgpack/v2) Fixed in 2.4.1
- Fix · CNA github.com/shamaton/msgpack/v3 (github.com/shamaton/msgpack/v3) Fixed in 3.1.1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Logging Subsystem for Red Hat OpenShift | Affected | No fix yet: Fix deferred |
| Pen Drive Powered by Red Hat Lightspeed | Affected | No fix yet: Fix deferred |
| Red Hat 3scale API Management Platform 2 | Affected | No fix yet: Fix deferred |
| Red Hat AI Inference Server | Affected | No fix yet: Fix deferred |
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet: Fix deferred |
| Red Hat Quay 3 | Affected | No fix yet: Fix deferred |
| Red Hat Satellite 6 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Hardened Images
Timeline
- 2026-10-02 Threatist record created from CVE-2026-32284
- 2026-10-03 Alias added: GHSA-h9q6-hc68-35rp
- 2026-10-07 Fix available: github.com/shamaton/msgpack/[email protected], github.com/shamaton/msgpack/[email protected] · CNA
- 2026-10-25 EPSS moved to the below the 50th percentile
References
Advisory 4
Sources
- CVE-2026-32284 · CVE Program
- CVE-2026-32284 · NVD
- FIRST EPSS
- GHSA-h9q6-hc68-35rp · GitHub Advisory Database · CC BY 4.0
- CVE-2026-32284 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences