Seroval: Deserialization invokes attacker-chosen callables: AsyncIteratorFactoryInstance calls source.on(listener) without type check

[ Description ]Official description

Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. This issue is fixed in version 1.6.8.

[ Fixes ]Fixes and patches

• seroval 1.6.8Fixed version · GitHub Advisories · npm package seroval: upgrade to 1.6.8 or later (affected <= 1.6.7)

[ Packages ]Affected open-source packages

• seroval npmAffected <= 1.6.7 · fixed in 1.6.8 · GHSA-7rv5-mrxv-xcr9

[ References ]References

• github.com/lxsmnsyc/seroval/commit/3edc78b495ea0d6bd498143e5b3e56996607c5f2
• github.com/lxsmnsyc/seroval/commit/50926b3ee198fb757e6ce3aa70efeed38d931c8d
• github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8
• github.com/lxsmnsyc/seroval/security/advisories/GHSA-7rv5-mrxv-xcr9