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CVE Vulnerability Details :
CVE-2026-59870
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 | 15:13
Updated At-08 Jul, 2026 | 15:50
Rejected At-
▼CVE Numbering Authority (CNA)
js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. This issue is fixed in version 5.2.1.

Affected Products
Vendor
nodeca
Product
js-yaml
Versions
Affected
  • >= 5.0.0, < 5.2.1
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
3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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-724g-mxrg-4qvm
x_refsource_CONFIRM
https://github.com/nodeca/js-yaml/commit/39f3211a2f01b3c6982710cf21434ab7060acefe
x_refsource_MISC
https://github.com/nodeca/js-yaml/releases/tag/5.2.1
x_refsource_MISC
Hyperlink: https://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvm
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/nodeca/js-yaml/commit/39f3211a2f01b3c6982710cf21434ab7060acefe
Resource:
x_refsource_MISC
Hyperlink: https://github.com/nodeca/js-yaml/releases/tag/5.2.1
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-724g-mxrg-4qvm
exploit
Hyperlink: https://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvm
Resource:
exploit
Details not found