CVE-2025-46597Network attack vector

Remote node crash via block-size check overflow

Published Mar 20, 2026 · Updated Mar 20, 2026

Integer overflow in Bitcoin Core 0.13.0 through 29.x allows remote attackers to crash 32-bit nodes with a pathological compact block. The pre-write block-size check overflows for blocks above 1 GB on 32-bit systems, allowing an oversized block to reach disk-writing logic and crash the process. Exploitation requires compact-block delivery and a non-default mempool above 3 GB that already holds about 1 GB of the block's transactions.

CVSS severity7.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Bitcoin Core 0.13.0 through 29.x allows remote attackers to crash 32-bit nodes with a pathological compact block. The pre-write block-size check overflows for blocks above 1 GB on 32-bit systems, allowing an oversized block to reach disk-writing logic and crash the process. Exploitation requires compact-block delivery and a non-default mempool above 3 GB that already holds about 1 GB of the block's transactions.

The record

CVE
CVE-2025-46597
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, CAPEC-92, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CAPEC-92Forced Integer Overflow
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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