Vulnerability Description
The devalue package for npm before 5.6.3 can consume excessive CPU and memory when serializing sparse arrays with uneval or stringify. An attacker who manages to get a sparse array created on the server, which mainstream wire formats do not allow, and serialized there can cause a denial of service.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/sveltejs/devalue/security/advisories/GHSA-33hq-fvwr-56pm
- https://www.vulncheck.com/advisories/devalue-before-5.6.3-denial-of-service-via-
FAQ
What is CVE-2026-123569?
CVE-2026-123569 is a vulnerability with a CVSS score of 7.5 (HIGH). The devalue package for npm before 5.6.3 can consume excessive CPU and memory when serializing sparse arrays with uneval or stringify. An attacker who manages to get a sparse array created on the serv...
How severe is CVE-2026-123569?
CVE-2026-123569 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-123569?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.