CVE-2026-32284
Denial of service in github.com/shamaton/msgpack
- Published
- Updated
- Reserved
- Assigned by
- Go
Description
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.
Public exploit
A reference of the record is tagged as an exploit or proof of concept: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
Timeline
ID reserved
By Go
- 15 days later
· 15 days later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.42% · top 63% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- CWE-125: Out-of-bounds Read
- CWE-125 (opens in a new tab)All about CWE-125 and its CVEs
Affected products
github.com/shamaton/msgpack · github.com/shamaton/msgpack
All versions: affected
github.com/shamaton/msgpack/v2 · github.com/shamaton/msgpack/v2
- affected < 2.4.1
github.com/shamaton/msgpack/v3 · github.com/shamaton/msgpack/v3
- affected < 3.1.1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/shamaton/msgpack/v2GHSA-h9q6-hc68-35rp (opens in a new tab)
- Gogithub.com/shamaton/msgpack/v3GHSA-h9q6-hc68-35rp (opens in a new tab)
References (4)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-h9q6-hc68-35rp (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-32284)Record last updated .