Out-of-bounds Read in Github.com/shamaton/msgpack
CVE-2026-32284
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/shamaton/msgpack/issues/59 (Issue Tracking, Vendor Advisory)
- github.com/golang/vulndb/issues/4513 (Third Party Advisory, Issue Tracking)
- pkg.go.dev/vuln/GO-2026-4513 (Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-32284?
- CVE-2026-32284 is a high-severity vulnerability in Github.com/shamaton/msgpack, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-03-26.
- How severe is CVE-2026-32284?
- High severity. CVSS v3 base score is 7.5 out of 10.