Bug 2498122 (CVE-2026-59869) - CVE-2026-59869 js-yaml: js-yaml: Denial of Service via crafted YAML documents
Summary: CVE-2026-59869 js-yaml: js-yaml: Denial of Service via crafted YAML documents
Keywords:
Status: NEW
Alias: CVE-2026-59869
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-08 16:02 UTC by OSIDB Bzimport
Modified: 2026-08-31 17:12 UTC (History)
191 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:57590 0 None None None 2026-08-20 16:07:30 UTC

Description OSIDB Bzimport 2026-07-08 16:02:01 UTC 
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, 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 versions 3.15.0 and 4.3.0.
Comment 4 errata-xmlrpc 2026-08-20 16:07:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:57590 https://access.redhat.com/errata/RHSA-2026:57590
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