---
id: CVE-2026-87735
title: An issue was discovered in the mirage-crypto-pk package before 2.3.0 for OCaml
summary: >-
  An issue was discovered in the mirage-crypto-pk package before 2.3.0 for
  OCaml. There is an undocumented exception for a small message during RSA
  decryption or encryption.
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-1284
vendor: OCaml
product: mirage-crypto-pk
affected:
  - mirage-crypto-pk < 2.3.0
published: '2026-09-09'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T19:17:50.430'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87735'
references:
  - url: 'https://osv.dev/vulnerability/OSEC-2026-14'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-09T18:39:48.567407Z'
ingestedAt: '2026-09-12T23:54:33.121Z'
epss: 0.00141
epssPercentile: 0.03822
---

## Overview

An issue was discovered in the mirage-crypto-pk package before 2.3.0 for OCaml. There is an undocumented exception for a small message during RSA decryption or encryption.

## Remediation

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