SB2026042856 - Uncontrolled Recursion in yaml
Published: April 28, 2026
Security Bulletin ID
SB2026042856
Severity
Low
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 security vulnerability.
1) Uncontrolled Recursion (CVE-ID: CVE-2026-33532)
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.
Remediation
Install update from vendor's website.