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npmPackage

yayson

1 known vulnerability (1 critical), with the versions each affects and the releases that fix them.

Latest release
4.4.0 (Sep 15, 2026): no advisory affects it
Newest unaffected release
4.4.0 (Sep 15, 2026), the latest release
Advisories
1 · 1 critical
Weekly downloads
5,050
Dependents
0
Releases
29 since 1.0.0 (Oct 7, 2014)
Registry
npm
Releases read
Nov 8, 2026

Version timeline

Every release cve.now has on record, lowest version on the left; each bar is a run of versions an advisory affects.

Advisories 1

  • CVE-2026-61534Critical 9.1

    Yayson: Prototype pollution in the Store/LegacyStore deserialization

    Affected: fixed in 4.3.0.

    Fixed in 4.3.0 (released Jun 22, 2026, 84 days before disclosure).

    The latest release, 4.4.0, is not affected.

    60% of yayson downloads last week were affected versions (3.6K).