All vulnerabilities
CVE-2026-104846GHSA-p6vx-979v-rg4c

Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of GHSA-mv8w-475r-vwqw)

lxsmnsyc serovalnpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.34%Chance of exploitation activity in the next 30 days, higher than 26% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.6.2Fixed versionGitHub
Published2 Oct 2026Updated 6 Oct 2026CVE List

What fixes it

  • 1.6.2seroval, npmGitHubnpm install seroval@1.6.2

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

A fulfilled Promise node deserialized by fromJSON() can trigger unintended invocation of a plugin-produced callable through native ECMAScript thenable assimilation. This bypasses the type-confusion fix in seroval@1.5.3 (GHSA-mv8w-475r-vwqw / CVE-2026-59940) and affects every plugin-capable release from 0.12.0 through the current 1.6.0.

Text from CVE List

Affected versions 3

  • seroval, npm>= 0.12.0, <= 1.6.0GitHub
  • serovalaffected: >= 0.12.0, < 1.6.2CVE List
  • seroval, npmfrom 0.12.0, fixed in 1.6.2OSV

References 4