| Name | CVE-2026-89087 |
| Description | The cstruct package before 6.3.0 for OCaml mishandles indexes. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1147522 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| ocaml-cstruct (PTS) | bookworm | 6.1.1-1 | vulnerable |
| trixie | 6.2.0-3 | vulnerable |
| forky, sid | 6.3.0-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[trixie] - ocaml-cstruct <no-dsa> (Minor issue)
[bookworm] - ocaml-cstruct <postponed> (Minor issue)
https://osv.dev/vulnerability/OSEC-2026-20
https://github.com/mirage/ocaml-cstruct/pull/324 (v6.3.0)