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CVE Vulnerability Details :
CVE-2026-59869
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-08 Jul, 2026 | 15:15
Updated At-09 Jul, 2026 | 15:14
Rejected At-
▼CVE Numbering Authority (CNA)
js-yaml: YAML merge-key chains can force quadratic CPU consumption

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.

Affected Products
Vendor
nodeca
Product
js-yaml
Versions
Affected
  • >= 3.0.0, < 3.15.0
  • >= 4.0.0, < 4.3.0
Problem Types
TypeCWE IDDescription
CWECWE-407CWE-407: Inefficient Algorithmic Complexity
Type: CWE
CWE ID: CWE-407
Description: CWE-407: Inefficient Algorithmic Complexity
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m
x_refsource_CONFIRM
https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7
x_refsource_MISC
https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4
x_refsource_MISC
https://github.com/nodeca/js-yaml/releases/tag/3.15.0
x_refsource_MISC
https://github.com/nodeca/js-yaml/releases/tag/4.3.0
x_refsource_MISC
Hyperlink: https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7
Resource:
x_refsource_MISC
Hyperlink: https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4
Resource:
x_refsource_MISC
Hyperlink: https://github.com/nodeca/js-yaml/releases/tag/3.15.0
Resource:
x_refsource_MISC
Hyperlink: https://github.com/nodeca/js-yaml/releases/tag/4.3.0
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m
exploit
Hyperlink: https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m
Resource:
exploit
Details not found