CVE catalog

CVE-2026-89087

The cstruct package before 6.3.0 for OCaml mishandles indexes.

Severity: High · CVSS 7.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published: Sep 10, 2026, 8:17:32 PM UTC
Updated: Sep 10, 2026, 8:17:32 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.32% · Oct 25, 2026

The cstruct package before 6.3.0 for OCaml mishandles indexes.

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-cstruct	sid	`6.3.0-1`	fixed
Debian	ocaml-cstruct	forky	`6.3.0-1`	fixed
Debian	ocaml-cstruct	trixie	`6.2.0-3`	vulnerable
Debian	ocaml-cstruct	bookworm	`6.1.1-1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ocaml-cstruct	source	sid	`6.3.0-1`	not yet assigned	Not reported	[1147522]
Debian	ocaml-cstruct	source	forky	`6.3.0-1`	not yet assigned	Not reported	[1147522]
Debian	ocaml-cstruct	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1147522]
Debian	ocaml-cstruct	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1147522]

[Debian bug #1147522]

Notes

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

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libcstruct-ocaml]Affected
Source package: [ocaml-cstruct]
Details (2)
- 6.1.1-1+b1 · amd64 · bookworm
  Affected
  nvd · ocaml-cstruct · debian · bookworm; nvd · ocaml-cstruct · debian · 12
- 6.1.1-1+b1 · arm64 · bookworm
  Affected
  nvd · ocaml-cstruct · debian · bookworm; nvd · ocaml-cstruct · debian · 12
[libcstruct-ocaml-dev]Affected
Source package: [ocaml-cstruct]
Details (2)
- 6.1.1-1+b1 · amd64 · bookworm
  Affected
  nvd · ocaml-cstruct · debian · bookworm; nvd · ocaml-cstruct · debian · 12
- 6.1.1-1+b1 · arm64 · bookworm
  Affected
  nvd · ocaml-cstruct · debian · bookworm; nvd · ocaml-cstruct · debian · 12

[Debian 13 (Trixie)]

[libcstruct-ocaml]Affected
Source package: [ocaml-cstruct]
Details (2)
- 6.2.0-3+b9 · amd64 · trixie
  Affected
  nvd · ocaml-cstruct · debian · 13
- 6.2.0-3+b9 · arm64 · trixie
  Affected
  nvd · ocaml-cstruct · debian · 13
[libcstruct-ocaml-dev]Affected
Source package: [ocaml-cstruct]
Details (2)
- 6.2.0-3+b9 · amd64 · trixie
  Affected
  nvd · ocaml-cstruct · debian · 13
- 6.2.0-3+b9 · arm64 · trixie
  Affected
  nvd · ocaml-cstruct · debian · 13

Observed: Oct 23, 2026, 9:28:26 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]