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.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1479 advisory.

    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. (CVE-2026-28364)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0175 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

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

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:20368-1 advisory.

    - CVE-2026-28364: missing bounds validation in readblock() can lead to arbitrary code execution     (bsc#1258992)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:0800-1 advisory.

    - CVE-2026-28364: missing bounds validation in readblock() can lead to arbitrary code execution     (bsc#1258992).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:0830-1 advisory.

    - CVE-2026-28364: missing bounds validation in readblock() can lead to arbitrary code execution     (bsc#1258992).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-28364)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
304275	Amazon Linux 2023 : ocaml, ocaml-compiler-libs, ocaml-ocamldoc (ALAS2023-2026-1479)	Nessus	Amazon Linux Local Security Checks	high
303489	TencentOS Server 4: ocaml (TSSA-2026:0175)	Nessus	Tencent Local Security Checks	high
303002	openSUSE 16 Security Update : ocaml (openSUSE-SU-2026:20368-1)	Nessus	SuSE Local Security Checks	high
301291	SUSE SLES15 Security Update : ocaml (SUSE-SU-2026:0800-1)	Nessus	SuSE Local Security Checks	high
301279	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : ocaml (SUSE-SU-2026:0830-1)	Nessus	SuSE Local Security Checks	high
300178	Linux Distros Unpatched Vulnerability : CVE-2026-28364	Nessus	Misc.	high

Detections

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CVE-2026-28364

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Tenable Plugins

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