CVE-2026-88351 Integer overflow in n/a
An integer overflow in MPack on 32-bit systems allows heap corruption and denial of service via crafted MessagePack data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88351?
CVE-2026-88351 is a critical vulnerability in n/a, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An integer overflow vulnerability exists in the MPack Node API in MPack 1.1.1 on 32-bit platforms. When parsing a specially crafted MessagePack array32 or map32 object with an excessively large element count, the page allocation size calculation in mpack_tree_parse_children() can overflow size_t and produce an undersized allocation. Subsequent parsing writes mpack_node_data_t records beyond the allocated heap buffer, resulting in heap-buffer-overflow, memory corruption, and denial of service.
Weakness: CWE-190
Which versions are affected by CVE-2026-88351?
How do I fix CVE-2026-88351?
No fix has been published for CVE-2026-88351 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-88351 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88351 exists.
Sources
Also known as GHSA-cmcq-v328-82vj, UBUNTU-CVE-2026-88351.