GHSA-vxpw-j846-p89q
Suggest an improvement- Source
- https://github.com/advisories/GHSA-vxpw-j846-p89q
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-vxpw-j846-p89q/GHSA-vxpw-j846-p89q.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-vxpw-j846-p89q
- Aliases
-
- CVE-2026-12151
- Downstream
- Related
- Published
- 2026-06-19T14:22:01Z
- Modified
- 2026-06-20T22:59:14.004992698Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- undici WebSocket client vulnerable to denial of service via fragment count bypass
- Details
-
Impact
The undici WebSocket client enforces
maxPayloadSizeon 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 theWebSocketStreamAPI 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 v6.27.0, v7.28.0 or v8.5.0.
Workarounds
No workaround is available. The fix must be applied through an upgrade.
- Database specific
{ "github_reviewed": true, "github_reviewed_at": "2026-06-19T14:22:01Z", "nvd_published_at": "2026-06-17T17:16:42Z", "severity": "HIGH", "cwe_ids": [ "CWE-400", "CWE-770" ] }- References
Affected packages
npm / undici
Package
- Name
- undici
- View open source insights on deps.dev
- Purl
- pkg:npm/undici
npm / undici
Package
- Name
- undici
- View open source insights on deps.dev
- Purl
- pkg:npm/undici
npm / undici
Package
- Name
- undici
- View open source insights on deps.dev
- Purl
- pkg:npm/undici