What’s Vulnerable › Vulnerabilities

CVE-2026-116581: Seroval: fromJSON deserializer trusts sequence doneAt (unauthenticated event-loop DoS)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-31
• Weakness: CWE-835

Description

Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON and fromCrossJSON do not validate a sequence node's done index. A crafted done index can create an iterator that never finishes when application code consumes it to completion. An unauthenticated request to a service that deserializes untrusted input can therefore block the event loop, exhaust process memory, or make the service unavailable. This issue is fixed in version 1.6.8.

Affected products

• lxsmnsyc seroval: before 1.6.8

References

• https://github.com/lxsmnsyc/seroval/commit/e176f9267e59ddd6c9de89cc9fe85c5b37a5b728
• https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8
• https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-97r2-qh9m-474h

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