Undici WebSocket deflate bug can crash the Node process
Direct answer
Undici WebSocket deflate bug can crash the Node process, also tracked as CVE-2026-85024 is a high-severity threat campaign HOL Guard tracked from Sep 3, 2026 to Sep 3, 2026, verified against 3 primary sources and last reviewed Sep 20, 2026. Active tracking has ended and the record remains published as a permanent historical research record.
Undici WebSocket permessage-deflate handling can crash the Node process. Upgrade to the patched release.
Also tracked as CVE-2026-85024
- First observed
- Sep 3, 2026
- Last observed
- Sep 3, 2026
- Last reviewed
- Sep 20, 2026
- Tracking ended
- Sep 3, 2026
Record exports
Uncertainty and limitations
Read the evidence limits before acting on this record.
Confirm exact fixed version against the live advisory.
- Campaign tracks CVE-2026-85024 only.
- HOL blog is operator guidance.
Guard coverage and policy
What Guard's reviewed assertions do and do not claim for this campaign, and the reviewed starting points for defense.
No Guard coverage mapping or campaign-specific policy guidance is published for this record.
Safe next step. Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.
Timeline
Reviewed events, oldest first, each tied to a verified source.
- Disclosure
CVE-2026-85024 Undici WebSocket deflate DoS disclosed.
Publication clock: 427.1 hours from reviewed disclosure timestamp to HOL publication; 24-hour high target; historical backfill outside target.
Sources
Every claim on this record is traceable to the sources below.
Campaign questions, answered
Undici WebSocket permessage-deflate handling can crash the Node process. Upgrade to the patched release. HOL Guard tracked the campaign from Sep 3, 2026 to Sep 3, 2026.
No. Active tracking ended Sep 3, 2026; this page remains as a labeled historical research record and does not imply the threat is currently active.
The record cites 3 primary sources, names 0 reviewed artifacts, and was last fully reviewed Sep 20, 2026 by HOL Guard Security Publishing. Its uncertainty and limitations are stated on the record itself.
Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.
The permalink above is permanent. The full record can be downloaded from this page as JSON, an artifact CSV, and a STIX 2.1 bundle, and corrections can be requested through the published correction path on the record. Confirm exact fixed version against the live advisory.
Reviewed in full by HOL Guard Security Publishing.
- Published
- Last full review
- Last modified
Record HGTC-2026-01565534