Denial of service in Bitcoin Core via undo files with no size limit
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-770.
Summary
Bitcoin Core through 31.1 does not limit the size of undo files. This lets an unauthenticated remote attacker exhaust resources and cause a denial of service (CWE-770).
Written with Claude Haiku 5.5 from the sources below · 2026-11-04
Description from the CNA
Bitcoin Core through 31.1 is vulnerable to Denial of Service via undo files having no size limit
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Bitcoin Core.
Written with Claude Haiku 5.5 from the sources below · 2026-11-04
Timeline
- 2026-10-30 Threatist record created from CVE-2026-117346
- 2026-10-30 Alias added: GHSA-chgh-55w7-23p2
- 2026-11-04 CVSS score added · CISA ADP
- 2026-11-04 Weakness changed · CISA ADP
- 2026-11-04 CISA SSVC decision points changed
Sources
- CVE-2026-117346 · CVE Program
- CVE-2026-117346 · NVD
- FIRST EPSS
- GHSA-chgh-55w7-23p2 · GitHub Advisory Database · CC BY 4.0
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