CVE-2026-12151 Affecting v8-12.4-devel package, versions <3:12.4.254.21-1.22.23.1.1.module+el9.8.0+40240+779db2c0


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.79% (52nd percentile)

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  • Snyk IDSNYK-ROCKY9-V8124DEVEL-17988285
  • published16 Jul 2026
  • disclosed17 Jun 2026

Introduced: 17 Jun 2026

CVE-2026-12151  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:9 v8-12.4-devel to version 3:12.4.254.21-1.22.23.1.1.module+el9.8.0+40240+779db2c0 or higher.
This issue was patched in RLSA-2026:35892.

NVD Description

Note: Versions mentioned in the description apply only to the upstream v8-12.4-devel package and not the v8-12.4-devel package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:9 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