CVE-2026-119051: flat through 6.0.1 contains an uncontrolled resource allocation vulnerability in unflatten() that allows attackers to cr…
flat through 6.0.1 contains an uncontrolled resource allocation vulnerability in unflatten() that allows attackers to create huge sparse arrays via unbounded numeric keys. Attackers can supply flattened keys such as a.4294967294, causing iteration with forEach, spread or JSON.stringify to block the Node.js event loop.
- Published by source
- 2026-10-29
- First seen by Reality Radar
- 2026-10-29
- Last verified
- 2026-10-29
What the official notice says
Risk: CVSS 8.2
Is this affecting you?
Add what you own or use and Reality Radar will tell you when official changes match it — with evidence and next steps.
Sources
- NIST National Vulnerability Database Tier A · official published 2026-10-29
Evidence ledger
Every piece of evidence we store is appended to a public hash chain, so later edits are detectable. Anyone can re-verify it.
| Entry | Kind | Observed | Evidence hash | Entry hash |
|---|---|---|---|---|
| #2999 | new | 2026-10-29 | f4d0c29566f2…af1f86 | 74810e239ac0…83bff9 |
Chain head: #3001 80f323478457…4b8d7a