Critical (9.8) in valvesoftware game networking sockets. EPSS 6.0% chance of exploitation in the next 30 days.
Valve's Game Networking Sockets prior to version v1.2.0 improperly handles unreliable segments with negative offsets in function SNP_ReceiveUnreliableSegment(), leading to a Heap-Based Buffer Underflow and a free() of memory not from the heap, resulting in a memory corruption and probably even a remote code execution.
Severity
CVSS 3.1
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
6.0% chance of exploitation in the next 30 days; higher than 93% of CVEs (scores of 2026-10-31)