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THREAT OPS › Threat News › [NVD] CVE-2026-59868 (MEDIUM 5.3) — js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This i

[NVD] CVE-2026-59868 (MEDIUM 5.3) — js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This i

mednvdPublished 2026-07-08

CVE-2026-59868 CVSS: 5.3 MEDIUM Published: 2026-07-08T16:16:33.270

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in version 5.2.0.

MITRE ATT&CK techniques

Indicators of compromise

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-59868