CVE-2026-59940

critical · 9.8

Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.5.3, seroval.fromJSON() allows attacker-controlled JSON Promise control nodes to operate on values from the general deserialization reference table without verifying genuine internal Promise resolver records, causing deserialization side effects with plugins enabled and potentially unintended server-side invocation or remote code execution when downstream frameworks register callable wrappers. This issue is fixed in version 1.5.3.

9.8

CVSS

0.8%

EPSS (exploit prob.)

57th

EPSS percentile

2026-08-18

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-502CWE-843

References

https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-mv8w-475r-vwqw

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-59940