CVE-2026-12151 Affecting npm24 package, versions <24.18.0-160000.1.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.79% (52nd percentile)

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  • Snyk IDSNYK-SLES1600-NPM24-17978214
  • published15 Jul 2026
  • disclosed6 Jul 2026

Introduced: 6 Jul 2026

CVE-2026-12151  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 npm24 to version 24.18.0-160000.1.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream npm24 package and not the npm24 package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service.

Affected applications are those using the undici WebSocket client (new WebSocket(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint.

All releases starting at undici 6.17.0 are affected.

Patches: Upgrade to undici >= 6.26.0, >= 7.28.0, or >= 8.5.0. Workarounds: No workaround is available. The fix must be applied through an upgrade.

CVSS Base Scores

version 3.1