CVE-2026-116584 Seroval `fromJSON`/`fromCrossJSON` denial of service via unvalidated array node length
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-116584?
CVE-2026-116584 is a high-severity vulnerability in lxsmnsyc seroval, published on 26 Oct 2026.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-116584?
2 open source packages ship an affected version, including seroval.
| Package | Affected | Fixed in |
|---|---|---|
seroval npm | From 1.4.1 | 1.6.8 |
seroval npm | From 1.4.1 | 1.6.8 |
How do I fix CVE-2026-116584?
Upgrade seroval to 1.6.8 or later.
Is CVE-2026-116584 being exploited?
There is no known exploitation of CVE-2026-116584 in the wild and no public exploit code.
Sources
Also known as GHSA-wp97-x4hv-qvhp.