CVE-2026-45783: CWE-20: Improper Input Validation in libp2p js-libp2p
libp2p is a JavaScript Implementation of libp2p networking stack. Prior to version 16.2.6, an unauthenticated remote peer can exhaust the disk storage of any @libp2p/kad-dht node running in server mode by sending an unbounded stream of PUT_VALUE messages whose keys bypass all content validation. No credentials, no prior relationship, and no protocol deviation beyond a crafted key are required. The victim node's datastore fills until the host disk is exhausted, making the node unavailable. This issue has been patched in version 16.2.6.
AI Analysis
Technical Summary
The vulnerability CVE-2026-45783 in js-libp2p (a JavaScript implementation of the libp2p networking stack) involves improper input validation (CWE-20) leading to resource exhaustion (CWE-400). Specifically, before version 16.2.6, an unauthenticated remote peer can send an unlimited number of PUT_VALUE messages with crafted keys that bypass content validation to any @libp2p/kad-dht node running in server mode. This causes the victim node's datastore to fill up, exhausting disk storage and rendering the node unavailable. No credentials or prior relationship are required to exploit this vulnerability. The issue is addressed by patching to version 16.2.6.
Potential Impact
An attacker can cause a denial of service by exhausting the disk storage of a vulnerable node, making the node unavailable. There is no confidentiality or integrity impact reported. The attack requires no authentication or protocol deviation beyond sending crafted keys. This can disrupt network operations relying on the affected node.
Mitigation Recommendations
Upgrade js-libp2p to version 16.2.6 or later, where this vulnerability is patched. There is no indication of alternative mitigations or temporary fixes. Patch status is confirmed by the vendor advisory stating the fix is in version 16.2.6.
CVE-2026-45783: CWE-20: Improper Input Validation in libp2p js-libp2p
Description
libp2p is a JavaScript Implementation of libp2p networking stack. Prior to version 16.2.6, an unauthenticated remote peer can exhaust the disk storage of any @libp2p/kad-dht node running in server mode by sending an unbounded stream of PUT_VALUE messages whose keys bypass all content validation. No credentials, no prior relationship, and no protocol deviation beyond a crafted key are required. The victim node's datastore fills until the host disk is exhausted, making the node unavailable. This issue has been patched in version 16.2.6.
CVSS v3.1
Score 7.5high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-45783 in js-libp2p (a JavaScript implementation of the libp2p networking stack) involves improper input validation (CWE-20) leading to resource exhaustion (CWE-400). Specifically, before version 16.2.6, an unauthenticated remote peer can send an unlimited number of PUT_VALUE messages with crafted keys that bypass content validation to any @libp2p/kad-dht node running in server mode. This causes the victim node's datastore to fill up, exhausting disk storage and rendering the node unavailable. No credentials or prior relationship are required to exploit this vulnerability. The issue is addressed by patching to version 16.2.6.
Potential Impact
An attacker can cause a denial of service by exhausting the disk storage of a vulnerable node, making the node unavailable. There is no confidentiality or integrity impact reported. The attack requires no authentication or protocol deviation beyond sending crafted keys. This can disrupt network operations relying on the affected node.
Mitigation Recommendations
Upgrade js-libp2p to version 16.2.6 or later, where this vulnerability is patched. There is no indication of alternative mitigations or temporary fixes. Patch status is confirmed by the vendor advisory stating the fix is in version 16.2.6.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T07:45:21.252Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a29dafc318757064995942d
Added to database: 06/10/2026, 21:45:32 UTC
Last enriched: 06/10/2026, 22:00:35 UTC
Last updated: 07/19/2026, 05:26:46 UTC
Views: 78
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