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CVE-2025-27209

HIGH
7.5
CVSS Score
Published: July 18, 2025 at 10:54 PM UTC
Updated: June 17, 2026 at 09:03 AM UTC
1 product affected across 1 vendorNode.js

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Node.js· Node.js
60%
24.0.0 ≤ v < 24.4.124.0.0
Affected range stops below 24.4.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: [email protected]
https://nodejs.org/en/blog/vulnerability/july-2025-security-releases
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2025/07/22/2

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHhackerone
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-407

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