CVE-2026-22036
Medium
Description
Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.
SeverityMedium
CVSS5.9
Exploit probability—
ProductNodejs Undici
PublishedJan 14, 2026
First seenJan 14, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- nodejs undici6.23.0, 7.18.2 or later
- undici7.18.2, 6.23.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nodejs undici | v < 6.23.0, 7.0.0 ≤ v < 7.18.2 | 6.23.0, 7.18.2 |
| undicinpm | 7.0.0 ≤ v < 7.18.2, v < 6.23.0 | 7.18.2, 6.23.0 |
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