CVE-2026-32284
This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.42%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.42% probability · 36th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- shamaton/msgpack
- Source
- security@golang.org
EPSS 0.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/golang/vulndb/issues/4513Issue Tracking, Third Party Advisory
- https://github.com/shamaton/msgpack/issues/59Issue Tracking, Vendor Advisory
- https://pkg.go.dev/vuln/GO-2026-4513Third Party Advisory
- https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.