Cyber Resilience

CVE-2025-27209

HighDDoS

Published: 18 July 2025

Published
18 July 2025
Modified
15 April 2026
KEV Added
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Patch
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CVSS Score v3 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0015 35.2th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-27209 is a high-severity Inefficient Algorithmic Complexity (CWE-407) vulnerability in Nodejs (inferred from references). Its CVSS base score is 7.5 (High).

Operationally, ranked at the 35.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

The V8 release used in Node.js v24.0.0 has changed how string hashes are computed using rapidhash. This implementation re-introduces the HashDoS vulnerability as an attacker who can control the strings to be hashed can generate many hash collisions - an…

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attacker can generate collisions even without knowing the hash-seed. * This vulnerability affects Node.js v24.x users.

CWE(s)
CWE-407

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

Nodejs
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inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-5 Denial-of-service Protection
addresses: CWE-407

Addresses inefficient algorithms whose complexity can be exploited for DoS.

References