High severity · published Oct 26, 2026
CVE-2026-116581
Seroval: fromJSON deserializer trusts sequence doneAt (unauthenticated event-loop DoS)
New
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
seroval · lxsmnsyc
< 1.6.8 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116581
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116581
github.com
https://github.com/lxsmnsyc/seroval/commit/e176f9267e59ddd6c9de89cc9fe85c5b37a5b728
github.com
https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8
github.com
https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-97r2-qh9m-474h
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