GHSA-97r2-qh9m-474h: seroval (CVE-2026-116581)

Package	Ecosystem	Affected	Fixed in
seroval	npm	<1.6.8	1.6.8

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The npm package seroval versions before 1.6.8 are affected. In these versions, the fromJSON and fromCrossJSON deserializers do not check two node fields: an array node's element list and a sequence node's done index. An unauthenticated attacker who can send untrusted input to these functions can make a small payload block the thread during decoding, or produce an iterator that never finishes, making the service unavailable. Upgrade to seroval 1.6.8, which validates these fields and throws SerovalMalformedNodeError on invalid input; the source lists no workaround.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0045, the 39th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

26 Oct 2026, 20:41 UTC Confirmed by the CVE List
31 Oct 2026, 13:32 UTC First seen by agentprime
31 Oct 2026, 13:32 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.