---
id: CVE-2026-97152
title: >-
  Nanomsg versions 0.5-beta through 1.x before 1.2.3 has a remotely exploitable
  buffer overflow in the WebSocket transport, due to an unchecked copy of the
  Sec-WebSocket-Version header, through snprintf.
summary: >-
  Nanomsg versions 0.5-beta through 1.x before 1.2.3 has a remotely exploitable
  buffer overflow in the WebSocket transport, due to an unchecked copy of the
  Sec-WebSocket-Version header, through snprintf.
severity: high
cvss: 8.6
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H'
cwe:
  - CWE-122
vendor: Nanomsg
product: Nanomsg
affected:
  - Nanomsg >= 0.5.0 < 1.2.3
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T04:18:06.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97152'
references:
  - url: 'https://github.com/nanomsg/nanomsg/pull/1130'
    label: cve@mitre.org
  - url: 'https://github.com/nanomsg/nanomsg/releases/tag/1.2.3'
    label: cve@mitre.org
  - url: 'https://nanomsg.org'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-24T03:37:24.188Z'
---

## Overview

Nanomsg versions 0.5-beta through 1.x before 1.2.3 has a remotely exploitable buffer overflow in the WebSocket transport, due to an unchecked copy of the Sec-WebSocket-Version header, through snprintf.

## Remediation

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