Uncontrolled Recursion in yaml - CVE-2026-33532
Published: April 28, 2026
Vulnerability identifier: #VU128317
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33532
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in the node resolution/composition phase when parsing deeply nested YAML collections. A remote user can supply a specially crafted YAML document to cause a denial of service.
All three public parsing APIs are affected: YAML.parse(), YAML.parseDocument(), and YAML.parseAllDocuments(). The parser CST phase is not affected.
Affected software
yaml
IBM Maximo Application Suite
IBM Maximo Application Suite
How to mitigate CVE-2026-33532
Install security update from vendor's website.
yaml - addressed in versions 1.10.3, 2.8.3
IBM Maximo Application Suite - addressed in versions 9.0.25, 9.1.14, 9.2.1
IBM Maximo Application Suite - addressed in versions 9.0.25, 9.1.14, 9.2.1