CVE-2025-62410
CVE-2025-62410 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1321.
Key facts
- Severity: Critical (CVSS 4.0 base score 9.4)
- EPSS exploit prediction: 0% (24th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-34678
- Weakness: CWE-1321
- Published:
- Last modified:
Description
In versions before 20.0.2, it was found that --disallow-code-generation-from-strings is not sufficient for isolating untrusted JavaScript in happy-dom. The untrusted script and the rest of the application still run in the same Isolate/process, so attackers can deploy prototype pollution payloads to hijack important references like "process" in the example below, or to hijack control flow via flipping checks of undefined property. This vulnerability is due to an incomplete fix for CVE-2025-61927. The vulnerability is fixed in 20.0.2.
Frequently asked questions
- What is CVE-2025-62410?
- In versions before 20.0.2, it was found that --disallow-code-generation-from-strings is not sufficient for isolating untrusted JavaScript in happy-dom. The untrusted script and the rest of the application still run in the same Isolate/process, so attackers can deploy prototype pollution payloads to hijack important references like "process" in the example below, or to hijack control flow via flipping checks of undefined property. This vulnerability is due to an incomplete fix for CVE-2025-61927. The vulnerability is fixed in 20.0.2.
- How severe is CVE-2025-62410?
- CVE-2025-62410 has a CVSS 4.0 base score of 9.4, rated critical severity.
- Is CVE-2025-62410 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-62410?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-62410 have an EU (EUVD) identifier?
- Yes. CVE-2025-62410 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34678.
- When was CVE-2025-62410 published?
- CVE-2025-62410 was published on 2025-10-15 and last updated on 2026-06-17.
References
- https://github.com/capricorn86/happy-dom/commit/f4bd4ebe3fe5abd2be2bcea1c07043c8b0b70eea
- https://github.com/capricorn86/happy-dom/security/advisories/GHSA-qpm2-6cq5-7pq5
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