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.
https://pkg.go.dev/vuln/GO-2026-4513
https://github.com/golang/vulndb/issues/4513
https://github.com/shamaton/msgpack/issues/59
Source: Mitre, NVD
Published: 2026-03-26
Updated: 2026-06-03
Base Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
Severity: High
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.00017