---
id: CVE-2026-117346
title: >-
  Bitcoin Core through 31.1 is vulnerable to Denial of Service via undo files
  having no size limit
summary: >-
  Bitcoin Core through 31.1 is vulnerable to Denial of Service via undo files
  having no size limit
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: adp
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-04T01:58:08.943248Z'
published: '2026-10-30'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T01:59:27.387Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-117346'
references:
  - url: 'http://bitcoin.com'
  - url: 'https://bitcoincore.org/en/2026/10/28/disclose-undo-overflow/'
tags:
  - cve.org
epss: 0.00488
epssPercentile: 0.42242
ingestedAt: '2026-11-05T20:33:06.660Z'
---

## Overview

Bitcoin Core through 31.1 is vulnerable to Denial of Service via undo files having no size limit

## Remediation

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