SB2026070346 - Resource exhaustion in js-yaml (npm)
Published: July 3, 2026
Security Bulletin ID
SB2026070346
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Resource exhaustion (CVE-ID: N/A)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the js-yaml parser when parsing YAML documents with merge keys enabled. A remote attacker can send a specially crafted YAML document containing a chain of merged mappings to cause a denial of service.
The issue occurs only when merge keys are enabled.
Remediation
Install update from vendor's website.