SB2026080658 - IBM PowerVC update for UltraJSON
Published: August 6, 2026
Security Bulletin ID
SB2026080658
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Memory leak (CVE-ID: CVE-2026-44660)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: 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]
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 the objToJSONFile() function when handling write failures in ujson.dump() to a file-like object. A remote attacker can trigger repeated failed write operations to cause a denial of service.
Each failed write leaks the full size of the serialized JSON payload.
Remediation
Install update from vendor's website.