CVE-2026-72854

A flaw was found in msgpack-c. An integer overflow vulnerability exists in the msgpackunpackerexpandbuffer function. This flaw can lead to an undersized memory buffer being allocated, even though the system reports a successful reservation. If an attacker can influence the length provided to the...

DEBIAN-CVE-2026-72854

msgpackunpackerexpandbuffer in src/unpack.c, reached through the public msgpackunpackerreservebuffer API, computes its new buffer size using an unchecked sizet addition of the requested size and the amount already used. The doubling loop guards its own multiplication against overflow, but the...