---
id: CVE-2026-87737
title: An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml
summary: >-
  An issue was discovered in the mirage-crypto-ec package before 2.4.0 for
  OCaml. There is a timing side channel for NIST elliptic-curve scalar
  multiplication: the time required for a lookup can depend on a secret.
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-208
vendor: OCaml
product: mirage-crypto-ec
affected:
  - mirage-crypto-ec < 2.4.0
published: '2026-09-09'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87737'
references:
  - url: 'https://osv.dev/vulnerability/OSEC-2026-17'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-09T13:09:56.811729Z'
ingestedAt: '2026-09-09T05:00:01.767Z'
epss: 0.00212
epssPercentile: 0.11814
---

## Overview

An issue was discovered in the mirage-crypto-ec package before 2.4.0 for OCaml. There is a timing side channel for NIST elliptic-curve scalar multiplication: the time required for a lookup can depend on a secret.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.