CVE-2026-102639: MobilityDB through 1.3.0 Out-of-bounds Read DoS via WKB Deserialization

MobilityDB version 1.3.0 and earlier contains an out-of-bounds read vulnerability in the MEOS binary and library WKB deserialization logic that allows unprivileged database users to crash the PostgreSQL backend process by supplying a crafted WKB payload with a negative length field. The negative length value wraps to a large unsigned sizet due to missing signed validation, bypasses an overflow-unsafe pointer arithmetic bounds check in wkbparsestatecheck(), and causes memcpy() in textfromwkbstate() to operate with a corrupted unbounded length, resulting in a remote denial-of-service condition affecting all sessions on the PostgreSQL instance.