CVE-2026-87018 undici - Denial of Service

undici HTTP client library for Node.js versions 4.2.1 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1 contains a denial of service caused by unhandled TLS 1.2 renegotiation with mismatched hostname certificates, letting attackers crash the client process, exploit requires attacker-controlled HTTPS endpoint.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Denial Of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
15 October 2026
Updated
16 October 2026
Weakness
CWE-248

Vendor fix

Upgrade to undici 6.29.1, 7.30.1, 8.12.2 or later versions.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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