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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| nodeca | js-yaml | affected |
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History
Wed, 08 Jul 2026 15:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | js-yaml: YAML merge-key chains can force quadratic CPU consumption | |
| Weaknesses | CWE-407 | |
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| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-08T15:18:19.422Z
Reserved: 2026-07-07T15:41:53.607Z
Link: CVE-2026-59868
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