CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-1528
High (7.5) in nodejs undici. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in undici 6.24.0, 7.24.0.
ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process.
Patches
Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.
Severity
- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-248, CWE-1284
- Published
- Modified
- Record from
- the NVD, synced
Affected
- nodejs:undici
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-f269-vfmq-vjvj | npm | undici | >=6.0.0 <6.24.0 | 6.24.0 |
| GHSA-f269-vfmq-vjvj | npm | undici | >=7.0.0 <7.24.0 | 7.24.0 |