GHSA-38rv-x7px-6hhq
Suggest an improvement- Source
- https://github.com/advisories/GHSA-38rv-x7px-6hhq
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-38rv-x7px-6hhq/GHSA-38rv-x7px-6hhq.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-38rv-x7px-6hhq
- Aliases
-
- CVE-2026-9675
- Downstream
- Published
- 2026-06-18T14:28:10Z
- Modified
- 2026-06-18T14:30:07.394033173Z
- 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 cumulative fragment bypass
- Details
-
Impact
The undici WebSocket client enforces
maxPayloadSizeper-frame but does not enforce the cumulative size of fragmented uncompressed messages. A malicious WebSocket server can stream many small fragments that each pass per-frame validation but collectively exceed the configured limit, 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(...)) that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint.This is a regression specific to undici 8.1.0. The 6.25.0 line shipped the equivalent cumulative check from the start and is unaffected. The 7.x line never had the
maxPayloadSizefeature and is also unaffected.Patches
Upgrade to undici >= 8.5.0.
Workarounds
No workaround is available. The fix must be applied through an upgrade.
- Database specific
{ "nvd_published_at": "2026-06-17T17:17:28Z", "severity": "HIGH", "github_reviewed": true, "cwe_ids": [ "CWE-400", "CWE-770" ], "github_reviewed_at": "2026-06-18T14:28:10Z" }- References
Affected packages
npm / undici
Package
- Name
- undici
- View open source insights on deps.dev
- Purl
- pkg:npm/undici