Vulnerability Description
Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to uneval, producing a very large serialized string that exhausts memory or CPU.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32
- https://www.vulncheck.com/advisories/devalue-before-5.9.3-quadratic-expansion-de
FAQ
What is CVE-2026-123565?
CVE-2026-123565 is a vulnerability with a CVSS score of 7.5 (HIGH). Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted paylo...
How severe is CVE-2026-123565?
CVE-2026-123565 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-2026-123565?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.