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PatchSiren cyber security CVE debrief

CVE-2026-89087 OCaml CVE debrief

The cstruct package before 6.3.0 for OCaml mishandles indexes, potentially leading to security issues. This CVE was published on 2026-09-10T20:17:32.247Z and was last modified on 2026-09-14T16:17:22.367Z. The vulnerability could allow attackers to exploit the mishandled indexes, which may lead to various security issues. Defenders should prioritize verifying the version of the cstruct package in use and consider upgrading to version 6.3.0 or later to mitigate potential risks. Additionally, defenders should monitor for potential security issues related to the cstruct package and review compensating controls for exposed systems while remediation is scheduled and verified.

Vendor
OCaml
Product
cstruct
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-10
Original CVE updated
2026-09-14
Advisory published
2026-09-10
Advisory updated
2026-09-14

Who should care

Defenders responsible for OCaml systems and packages should be aware of this potential security issue and take steps to verify and mitigate as necessary.

Why it matters

The cstruct package before 6.3.0 for OCaml mishandles indexes, potentially leading to security issues. Defenders should prioritize verifying the version of the cstruct package in use and consider upgrading to version 6.3.0 or later.

  • Verify the version of the cstruct package in use
  • Consider upgrading to version 6.3.0 or later
  • Monitor for potential security issues related to the cstruct package

Technical summary

The cstruct package before 6.3.0 for OCaml mishandles indexes. This could potentially lead to security issues. The vulnerability is related to the mishandling of indexes in the cstruct package, which may allow attackers to exploit the vulnerability. Defenders should prioritize verifying the version of the cstruct package in use and consider upgrading to version 6.3.0 or later to mitigate potential risks.

Defensive priority

Defenders should prioritize verifying the version of the cstruct package in use and consider upgrading to version 6.3.0 or later.

Recommended defensive actions

  • Verify the version of the cstruct package in use
  • Consider upgrading to version 6.3.0 or later
  • Monitor for potential security issues related to the cstruct package

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation is needed to determine the full scope of the issue.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-89087 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-89087

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-89087 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-89087

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.