> CVE-2026-59869 [HIGH]

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PUBLISHED
2026-07-08 16:16
MODIFIED
2026-07-08 16:16
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.59%
Top 52.0%
DATA SOURCES:
NVD đź”— 2026-07-08 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 GITHUB đź”— 2026-10-29 OSV đź”— 2026-11-02 MSRC đź”— 2026-08-01

> DESCRIPTION

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

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EXPLOITABILITY
3.9
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-407

> CWE DETAILED DESCRIPTIONS

CWE-407: Inefficient Algorithmic Complexity - An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

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> GITHUB SECURITY ADVISORY

GHSA-52cp-r559-cp3m HIGH

js-yaml: YAML merge-key chains can force quadratic CPU consumption

AFFECTED PACKAGES:
NPM / js-yaml
>= 4.0.0, < 4.3.0
Fixed in: 4.3.0
NPM / js-yaml
>= 3.0.0, < 3.15.0
Fixed in: 3.15.0

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

js-yaml: YAML merge-key chains can force quadratic CPU consumption

AFFECTED PACKAGES:
Unknown / Unknown
51 versions affected
ALIASES:
GHSA-52cp-r559-cp3m

> HISTORIQUE DES MODIFICATIONS

Première apparition
08/07/2026 16:16
Source: NVD
đź“Š ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-407: Inefficient Algorithmic Complexity - An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an ...
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b...
https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e...
https://github.com/nodeca/js-yaml/releases/tag/3.15.0
https://github.com/nodeca/js-yaml/releases/tag/4.3.0
https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m
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