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
EPSS: 0.001 (24.7th percentile) — read the EPSS interpretation.
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.
Affected products
Weakness classification (CWE)
References
- security@golang.org (Issue Tracking, Vendor Advisory)
- security@golang.org (Third Party Advisory, Issue Tracking)
- security@golang.org (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.