High severity · published Mar 26, 2026
CVE-2026-32284
Denial of service in github.com/shamaton/msgpack
7.5
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
github.com/shamaton/msgpack · github.com/shamaton/msgpack
All versions, or not specified · source: vendor
GI
github.com/shamaton/msgpack/v2 · github.com/shamaton/msgpack/v2
before 2.4.1 · source: vendor
GI
github.com/shamaton/msgpack/v3 · github.com/shamaton/msgpack/v3
before 3.1.1 · source: vendor
MS
Msgpack · Shamaton
through 3.1.2 · source: NVD
Affected product
GI
github.com/shamaton/msgpack
github.com/shamaton/msgpack