CVE-2024-52911 – High‑Severity Memory‑Safety Bug in Bitcoin Core
Key takeaways
- High‑severity use‑after‑free bug in the script validation engine.
- Affects Bitcoin Core versions 0.14.0‑28.x; patch in v29.0.
- Could let miners crash nodes or execute code remotely; exploitation is costly and unobserved.
- ~43 % of nodes remain on vulnerable releases.
- Immediate action: verify version and upgrade to v29.0 or later.
Overview
The CVE-2024-52911 vulnerability is a high‑severity use‑after‑free flaw discovered in the parallel script validation engine of Bitcoin Core. It was responsibly disclosed by Cory Fields of the MIT Digital Currency Initiative in November 2024, publicly disclosed on 5 May 2026, and a patch was released in Bitcoin Core v29.0 (April 2025). This is the first memory‑safety bug ever reported in the project’s history.
Technical Details
- Vulnerability type: Use‑after‑free in the parallel script validation engine, which processes transaction scripts concurrently.
- Trigger: A miner can embed a specially crafted invalid block that causes the engine to free a memory object while it is still in use.
- Consequence: The freed memory may be re‑allocated with attacker‑controlled data, leading to a crash (Denial‑of‑Service) or, in theory, remote code execution (RCE) on the victim node.
- Exploit cost: The attack requires the miner to waste hash‑power on invalid blocks, making large‑scale exploitation economically unattractive. No confirmed exploits have been observed in the wild.
- Disclosure & PoC: A proof‑of‑concept was released alongside the advisory; however, it demonstrates the crash path rather than a reliable RCE chain.
Severity & Impact
The bug is rated high‑severity because it can:
- Denial‑of‑Service: Crash a node, potentially disrupting network connectivity for that participant.
- Remote Code Execution: Theoretically allow arbitrary code execution, though the required conditions are difficult to meet in practice.
| Metric | Value |
|---|---|
| CVE ID | CVE-2024-52911 |
| Severity | High |
| Impact | Node crash (DoS) and possible RCE |
| CVSS | Not publicly disclosed (see CVE page) |
Threat activity: Over the past week the vulnerability generated 45 mentions across 6 days, peaking at 21 mentions on 6 May 2026. One signal on 7 May 2026 flagged “active exploitation reported,” but no public exploit has been confirmed.
Affected Products
- Bitcoin Core versions 0.14.0 through 28.x (including 0.14.1‑28.4).
- The last vulnerable release line reached end‑of‑life in March 2025.
For the complete list of affected versions and CPE entries, see the official CVE record: https://vulnsocial.com/cve/CVE-2024-52911.
Actionable Insights
- Version audit: Identify the version of Bitcoin Core running on every node in your infrastructure.
- Upgrade priority: Nodes still on any pre‑v29 release should be upgraded immediately; v29.0 contains the official fix for CVE-2024-52911.
- Monitoring: Watch for unusually high rates of invalid block propagation or node crashes. The Clark Moody dashboard can be used to gauge the proportion of vulnerable nodes (currently ~43 %).
- Network hygiene: Encourage peers to update; consider blacklisting peers that repeatedly send malformed blocks.
- Patch visibility: Track the live threat timeline on the VulnSocial CVE page for any emerging exploitation attempts: https://vulnsocial.com/cve/CVE-2024-52911.
Remediation & Mitigation
- Upgrade all Bitcoin Core instances to v29.0 or later. This version contains the official patch for CVE-2024-52911.
- Enable automatic updates where possible to avoid lagging behind future security releases.
- If upgrade is not feasible, temporarily disable the parallel script validation engine (e.g., start the node with
-disableparallelif supported) until a back‑ported fix can be applied. - Monitor node logs for messages indicating script‑validation crashes or malformed block rejections.
- Validate peer behavior: use network monitoring tools to flag peers that consistently submit invalid blocks; consider isolating or banning them.
Bottom line
CVE-2024-52911 is a high‑severity memory‑safety flaw in Bitcoin Core that can crash nodes and potentially enable remote code execution. The vulnerability has been fully patched in v29.0, but a substantial portion of the network (~43 %) still runs vulnerable software. Immediate version verification and upgrade are the most effective defenses.
References
- https://bitcoincore.org/en/2026/05/05/disclose-cve-2024-52911/
- https://bitcoinops.org/en/newsletters/2026/05/15/#bitcoin-core-script-interpreter-remote-crash-disclosure
- https://crypto-economy.com/bitcoin-core-fixes-critical-memory-bug-in-secret-leaving-older-nodes-at-risk/
- https://crypto.news/bitcoin-core-discloses-bug-that-could-let-miners-crash-nodes/
- https://cryptoadventure.com/bitcoin-core-high-severity-bug-exposes-old-node-upgrade-risk/
- https://securityonline.info/bitcoin-core-cve-2024-52911-use-after-free-node-crash-fix/
- https://thecoding.substack.com/p/easily-explaining-bitcoin-cores-memory-bug
- https://thecoinheadlines.com/blockchain/warning-first-bitcoin-memory-bug-43-percent-of-nodes-are-unpatched/article-16620/
- https://thecurrencyanalytics.com/bitcoin/cve-2024-52911-bitcoin-core-miners-could-have-crashed-nodes-executed-remote-code-256466
- https://threatcluster.io/cluster/critical-bitcoin-core-vulnerability-cve-2024-52911-exposes-4-96c064b8
- https://vulmon.com/vulnerabilitydetails?qid=CVE-2024-52911
- https://www.cve.org/CVERecord?id=CVE-2024-52911
- https://x.com/BitcoinNewsCom/status/2052470773873357103
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