CVE-2026-59868

mediumCVSS 5.3covered by 1 sourcefirst seen 2026-07-08

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.

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Exploitation outlook

Low exploitation risk0.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-59868: js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are e…nvd · 2026-07-08

External references

NVD record for CVE-2026-59868

CVE.org record

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