CVE-2026-89087 Details
Description
The cstruct package before 6.3.0 for OCaml mishandles indexes.
A vulnerability exists in the OCaml cstruct package versions prior to 6.3.0, where indexing errors can lead to corrupted data and unexpected exceptions. These logical errors in data handling may disrupt the output of certain functions, potentially causing validation bypasses, denial-of-service conditions, or unintended disclosure of adjacent buffer contents in security-sensitive applications.
Users should upgrade to version 6.3.0 or later. Those unable to upgrade can backport the necessary source changes.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 10, 2026CISA-ADP
Assessed Sep 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://osv.dev/vulnerability/OSEC-2026-20 | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-573 | Improper Following of Specification by Caller | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| cstruct | < 6.3.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | CISA-ADP |
| Sep 10, 2026 | New CVE Received | [email protected] |