CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Called exploited the same day it was disclosed.
Measured from the CVE publication date to the earliest of 1 KEV catalogue that list it.
The life of this vulnerability
- CVE published
- First KEV listingsame day
- Last sighting15d
Gaps are compressed to equal steps. The elapsed time is printed under each.
Which catalogues call it exploited
- CISA KEVUS federaldoes not list it
- EUVDENISA, European Uniondoes not list it
- VulnCheck KEVcommercial researchlisted Jul 23, 2026
- CIRCLaggregator, mirrors the abovelisted Jul 25, 2026, not counted
This rests on a single catalogue. No second catalogue corroborates the claim that it is being exploited. CIRCL is an aggregator and is not counted.
Public exploitation evidence
- reported exploitationwww.recordedfuture.com/blog/july-2026-cve-landscape
- reported exploitationwebflow.sysdig.com/blog/security-briefing-july-2026
- reported exploitationprevidian.com/CVE-2026-16723
- reported exploitationthreatbook.io/blog/fastjson-rce-1.2.83-active-exploitation-d
- reported exploitationwww.imperva.com/blog/imperva-customers-protected-against-cve
5 public reports collected from VulnCheck and CIRCL, first on Jul 23, 2026. Each links to its original source. We have not verified them.
Description
A remote code execution (RCE) vulnerability exists in fastjson 1.2.68 through 1.2.83. This vulnerability is exploitable under fastjson's stock default configuration — no AutoType enablement required, no classpath gadget required.
