Source: ocaml
Version: 5.4.0-3
Severity: important
Tags: security upstream
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for ocaml.

CVE-2026-28364[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-28364
    https://www.cve.org/CVERecord?id=CVE-2026-28364
[1] https://osv.dev/vulnerability/OSEC-2026-01
[2] 
https://github.com/ocaml/ocaml/commit/e3919fef436f89271bc30bbe8592851f7289fb68
[3] 
https://github.com/ocaml/ocaml/commit/b0a2614684a52acded784ec213f14ddfe085d146

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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