VulnerabilityAnalyzed
CVE-2026-59868
js-yaml is a JavaScript YAML parser and dumper.
HIGH 7.5EPSS 0.64%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.64%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.64% probability · 49th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-407, CWE-770
- Affected
- nodeca/js-yaml
- Source
- security-advisories@github.com
References
- https://github.com/nodeca/js-yaml/commit/3105455b81dee69e0fd36e09ac0b2ccfdb54adc1Patch
- https://github.com/nodeca/js-yaml/releases/tag/5.2.0Release Notes
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mvExploit, Vendor Advisory
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mvExploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.