CVE-2026-88351 MPack - Integer Overflow

MPack 1.1.1 on 32-bit platforms contains an integer overflow caused by improper size calculation in mpack_tree_parse_children() when parsing crafted MessagePack array32 or map32 objects, letting attackers cause heap buffer overflow and denial of service, exploit requires crafted MessagePack data.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.31% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Integer Overflow
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
24 September 2026
Updated
15 October 2026
Weakness
CWE-190

Vendor fix

Update to the latest version of MPack.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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