GHSA-jp82-f5mq-hwhp: seroval (CVE-2026-104845)

Package	Ecosystem	Affected	Fixed in
seroval	npm	<1.6.3	1.6.3

Machine-written summary

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

Seroval versions before 1.6.3 are affected. When deserializing TypedArray data from JSON, the library does not validate the input's type or bound the element count, so a small JSON payload that specifies a very large length can make the deserializer allocate a large amount of memory synchronously. An unauthenticated remote attacker who can send untrusted Seroval JSON to a service that deserializes it could exhaust CPU and memory and stall the event loop, with no confidentiality or integrity impact. Upgrade to seroval 1.6.3 or later, which is listed as the fixed version.

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 0.0043, the 37th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 13:34 UTC First seen by agentprime
31 Oct 2026, 13:34 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.