CVE-2026-28364

Summary

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() operations using attacker-controlled lengths from crafted Marshal data.

Affected Software

Weaknesses

• CWE-126: CWE-126 Buffer Over-read

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

ocaml: OCaml: Remote code execution via buffer over-read in Marshal deserialization

Additional References

• https://access.redhat.com/security/cve/CVE-2026-28364
• https://bugzilla.redhat.com/show_bug.cgi?id=2443348
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28364.json

References

• https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-01.json
• https://osv.dev/vulnerability/OSEC-2026-01

• ←Previous
• Next→