OSEC-2026-18 Marshal integer overflow leads to out-of-heap read

An integer overflow in the length-validation logic of OCaml's Marshal deserializer allows a crafted serialized object to bypass all bounds checks added by the CVE-2026-28364 fix, producing heap out-of-bounds reads from Marshal.frombytes / Marshal.fromstring and the C API camlinputvaluefromblock...

SUSE CVE-2026-28364

In OCaml before 4.14.3 and 5.x before 5.4.1, a buffer over-read in Marshal deserialization runtime/intern.c enables remote code execution through a multi-phase attack chain. The vulnerability stems from missing bounds validation in the readblock function, which performs unbounded memcpy operation...

OSEC-2026-01 Buffer Over-Read in OCaml Marshal Deserialization

Summary A critical buffer over-read vulnerability in OCaml's Marshal deserialization runtime/intern.c enables remote code execution through a multi-phase attack chain. The vulnerability stems from missing bounds validation in the readblock function, which performs unbounded memcpy operations usin...