Prototype pollution in Directus - #VU144558
Published: August 21, 2026
Vulnerability identifier: #VU144558
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a persistent denial of service.
The vulnerability exists due to improperly controlled modification of object prototype attributes in the global query-sanitization middleware handling the `deep` query parameter when parsing a user-supplied JSON string. A remote attacker can send a specially crafted GET request to cause a persistent denial of service.
The vulnerable code path is reached before any per-collection permission check, and supplying `deep` as an opaque JSON string bypasses the underlying query parser\'s stripping of prototype-named bracket keys.
Affected software
Directus
Remediation
Install security update from vendor's website.
Directus - update to 12.2.0