Memory leak in ultrajson - #VU147253
Published: September 7, 2026
Vulnerability identifier: #VU147253
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to missing release of memory after effective lifetime in ultrajson serialization functions when processing data with a default handler that recursively returns unserializable objects. A remote attacker can cause the default handler to recursively return unserializable objects to cause a denial of service.
Affected software
ultrajson
Remediation
Install security update from vendor's website.
ultrajson - update to 6.0.0