What’s Vulnerable › Vulnerabilities

CVE-2026-116584: Seroval `fromJSON`/`fromCrossJSON` denial of service via unvalidated array node length

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-26
• Weakness: CWE-770

Description

Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. From 1.4.1 until 1.6.8, fromJSON and fromCrossJSON do not require an array node's element list to be an actual array. A small crafted payload can supply an attacker-controlled length that determines memory allocation and decoder iterations independently of payload size, allowing an unauthenticated request to exhaust the process or block its thread. This issue is a residual bypass of the remediation for CVE-2026-23957. This issue is fixed in version 1.6.8.

Affected products

• lxsmnsyc seroval: from 1.4.1, < 1.6.8

References

• https://github.com/lxsmnsyc/seroval/commit/cdcee3e3bc384ee844360844f8ea98fd2b275d69
• https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8
• https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-wp97-x4hv-qvhp

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