CVE catalog

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

[CVE catalog]

Severity: High · CVSS 7.9CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Published: Feb 27, 2026, 3:54:53 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.24% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	ocaml	sid	`5.4.1-1`	fixed
Debian	ocaml	forky	`5.4.1-1`	fixed
Debian	ocaml	trixie	`5.3.0-3`	vulnerable
Debian	ocaml	bookworm	`4.13.1-4`	vulnerable
Cpe	ocaml	Not reported	Not reported	vulnerable
Opensuse	ocaml	tumbleweed	`4.14.4-1.1`	fixed
Opensuse	ocaml	leap 16.0	`4.14.2-160000.4.1`	fixed
Suse	ocaml	linux enterprise module for development tools 15 sp7	`4.14.2-150600.3.3.1`	fixed
Suse	ocaml	linux enterprise server 15 sp6-ltss	`4.14.2-150600.3.3.1`	fixed
Suse	ocaml	linux enterprise server for sap applications 15 sp6	`4.14.2-150600.3.3.1`	fixed
Opensuse	ocaml	leap 15.6	`4.14.2-150600.3.3.1`	fixed
Suse	ocaml	linux enterprise high performance computing 15 sp4-espos	`4.05.0-150200.15.3.1`	fixed
Suse	ocaml	linux enterprise high performance computing 15 sp4-ltss	`4.05.0-150200.15.3.1`	fixed
Suse	ocaml	linux enterprise high performance computing 15 sp5-espos	`4.05.0-150200.15.3.1`	fixed
Suse	ocaml	linux enterprise high performance computing 15 sp5-ltss	`4.05.0-150200.15.3.1`	fixed
Suse	ocaml	linux enterprise server 15 sp4-ltss	`4.05.0-150200.15.3.1`	fixed
Suse	ocaml	linux enterprise server 15 sp5-ltss	`4.05.0-150200.15.3.1`	fixed
Suse	ocaml	linux enterprise server for sap applications 15 sp4	`4.05.0-150200.15.3.1`	fixed
Suse	ocaml	linux enterprise server for sap applications 15 sp5	`4.05.0-150200.15.3.1`	fixed
Ubuntu	ocaml	pro	`4.04.0-2ubuntu4`	vulnerable
Ubuntu	ocaml	pro	`4.05.0-10ubuntu1`	vulnerable
Ubuntu	ocaml	pro	`4.05.0-10ubuntu1+esm1`	vulnerable
Ubuntu	ocaml	20.04	`4.05.0-12ubuntu3`	vulnerable
Ubuntu	ocaml	20.04	`4.08.1-8`	vulnerable
Ubuntu	ocaml	22.04	`4.11.1-4`	vulnerable
Ubuntu	ocaml	22.04	`4.11.1-5ubuntu1`	vulnerable
Ubuntu	ocaml	22.04	`4.13.1-3ubuntu1`	vulnerable
Ubuntu	ocaml	24.04	`4.13.1-6ubuntu1`	vulnerable
Ubuntu	ocaml	24.04	`4.14.1-1ubuntu1`	vulnerable
Ubuntu	ocaml	25.10	`5.3.0-2`	vulnerable
Ubuntu	ocaml	25.10	`5.3.0-3`	vulnerable
Ubuntu	ocaml	26.10	`5.4.0-3ubuntu1`	vulnerable
Ubuntu	ocaml	26.10	`5.4.1-1ubuntu1`	vulnerable
Ubuntu	ocaml	26.04	`5.3.0-3`	vulnerable
Ubuntu	ocaml	26.04	`5.4.0-1ubuntu1`	vulnerable
Ubuntu	ocaml	26.04	`5.4.0-2ubuntu1`	vulnerable
Ubuntu	ocaml	26.04	`5.4.0-3ubuntu1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ocaml	source	sid	`5.4.1-1`	not yet assigned	Not reported	[1129317]
Debian	ocaml	source	forky	`5.4.1-1`	not yet assigned	Not reported	[1129317]
Debian	ocaml	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1129317]
Debian	ocaml	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1129317]
Opensuse	ocaml	rpm	tumbleweed	`4.14.4-1.1`	Not reported	OPENSUSE-SU-2026:11136-1	Not reported
Opensuse	ocaml	rpm	leap 16.0	`4.14.2-160000.4.1`	Not reported	OPENSUSE-SU-2026:20368-1	Not reported
Suse	ocaml	rpm	linux enterprise module for development tools 15 sp7	`4.14.2-150600.3.3.1`	Not reported	SUSE-SU-2026:0830-1	Not reported
Suse	ocaml	rpm	linux enterprise server 15 sp6-ltss	`4.14.2-150600.3.3.1`	Not reported	SUSE-SU-2026:0830-1	Not reported
Suse	ocaml	rpm	linux enterprise server for sap applications 15 sp6	`4.14.2-150600.3.3.1`	Not reported	SUSE-SU-2026:0830-1	Not reported
Opensuse	ocaml	rpm	leap 15.6	`4.14.2-150600.3.3.1`	Not reported	SUSE-SU-2026:0830-1	Not reported
Suse	ocaml	rpm	linux enterprise high performance computing 15 sp4-espos	`4.05.0-150200.15.3.1`	Not reported	SUSE-SU-2026:0800-1	Not reported
Suse	ocaml	rpm	linux enterprise high performance computing 15 sp4-ltss	`4.05.0-150200.15.3.1`	Not reported	SUSE-SU-2026:0800-1	Not reported
Suse	ocaml	rpm	linux enterprise high performance computing 15 sp5-espos	`4.05.0-150200.15.3.1`	Not reported	SUSE-SU-2026:0800-1	Not reported
Suse	ocaml	rpm	linux enterprise high performance computing 15 sp5-ltss	`4.05.0-150200.15.3.1`	Not reported	SUSE-SU-2026:0800-1	Not reported
Suse	ocaml	rpm	linux enterprise server 15 sp4-ltss	`4.05.0-150200.15.3.1`	Not reported	SUSE-SU-2026:0800-1	Not reported
Suse	ocaml	rpm	linux enterprise server 15 sp5-ltss	`4.05.0-150200.15.3.1`	Not reported	SUSE-SU-2026:0800-1	Not reported
Suse	ocaml	rpm	linux enterprise server for sap applications 15 sp4	`4.05.0-150200.15.3.1`	Not reported	SUSE-SU-2026:0800-1	Not reported
Suse	ocaml	rpm	linux enterprise server for sap applications 15 sp5	`4.05.0-150200.15.3.1`	Not reported	SUSE-SU-2026:0800-1	Not reported

[Debian bug #1129317]

Notes

[trixie] ocaml: Minor issue [bookworm] ocaml: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[ocaml]Affected
Details (2)
- 4.13.1-4 · amd64 · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
- 4.13.1-4 · arm64 · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
[ocaml-base]Affected
Source package: [ocaml]
Details (2)
- 4.13.1-4 · amd64 · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
- 4.13.1-4 · arm64 · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
[ocaml-base-nox]Affected
Source package: [ocaml]
Details (2)
- 4.13.1-4 · all · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
- 4.13.1-4 · all · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
[ocaml-compiler-libs]Affected
Source package: [ocaml]
Details (2)
- 4.13.1-4 · amd64 · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
- 4.13.1-4 · arm64 · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
[ocaml-interp]Affected
Source package: [ocaml]
Details (2)
- 4.13.1-4 · amd64 · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
- 4.13.1-4 · arm64 · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
[ocaml-man]Affected
Source package: [ocaml]
Details (2)
- 4.13.1-4 · all · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
- 4.13.1-4 · all · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
[ocaml-nox]Affected
Source package: [ocaml]
Details (2)
- 4.13.1-4 · all · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
- 4.13.1-4 · all · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
[ocaml-source]Affected
Source package: [ocaml]
Details (2)
- 4.13.1-4 · all · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12
- 4.13.1-4 · all · bookworm
  Affected
  nvd · ocaml · debian · bookworm; nvd · ocaml · debian · 12

[Debian 13 (Trixie)]

[libcompiler-libs-ocaml-dev]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · amd64 · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · arm64 · trixie
  Affected
  nvd · ocaml · debian · 13
[libstdlib-ocaml]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · amd64 · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · arm64 · trixie
  Affected
  nvd · ocaml · debian · 13
[libstdlib-ocaml-dev]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · amd64 · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · arm64 · trixie
  Affected
  nvd · ocaml · debian · 13
[ocaml]Affected
Details (2)
- 5.3.0-3 · amd64 · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · arm64 · trixie
  Affected
  nvd · ocaml · debian · 13
[ocaml-base]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · amd64 · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · arm64 · trixie
  Affected
  nvd · ocaml · debian · 13
[ocaml-base-nox]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
[ocaml-compiler-libs]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
[ocaml-interp]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · amd64 · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · arm64 · trixie
  Affected
  nvd · ocaml · debian · 13
[ocaml-man]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
[ocaml-nox]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
[ocaml-source]Affected
Source package: [ocaml]
Details (2)
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13
- 5.3.0-3 · all · trixie
  Affected
  nvd · ocaml · debian · 13

[openSUSE Tumbleweed]

[ocaml-compiler-libs]Unknown
Source package: [ocaml]
Details (1)
- 5.5.0-2.1 · x86_64 · tumbleweed
  Unknown · Fixed: 4.14.4-1.1
  Version impact unknown
  nvd · ocaml · opensuse · tumbleweed

Next results

Observed: Oct 24, 2026, 12:38:15 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]