> CVE-2026-33203 [HIGH]

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PUBLISHED
2026-03-20 23:16
MODIFIED
2026-03-20 23:16
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.60%
Top 52.0%
DATA SOURCES:
NVD 🔗 2026-03-21 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-11-05

> DESCRIPTION

SiYuan is a personal knowledge management system. Prior to version 3.6.2, the SiYuan kernel WebSocket server accepts unauthenticated connections when a specific "auth keepalive" query parameter is present. After connection, incoming messages are parsed using unchecked type assertions on attacker-controlled JSON. A remote attacker can send malformed messages that trigger a runtime panic, potentially crashing the kernel process and causing denial of service. Version 3.6.2 fixes the issue.

> 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-248 CWE-306

> CWE DETAILED DESCRIPTIONS

CWE-248: Uncaught Exception - An exception is thrown from a function, but it is not caught. | CWE-306: Missing Authentication for Critical Functionality - The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

> GITHUB SECURITY ADVISORY

GHSA-3g9h-9hp4-654v HIGH

SiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass

AFFECTED PACKAGES:
GO / github.com/siyuan-note/siyuan/kernel
<= 3.6.1
Fixed in: 3.6.2

> HISTORIQUE DES MODIFICATIONS

Première apparition
20/03/2026 23:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:58
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-248: Uncaught Exception - An exception is thrown from a function, but it is not caught. | CWE-306: Missing Authentication for Critical Function - The product does not perform any authentication fo...
Nouvelle valeur:
CWE-248: Uncaught Exception - An exception is thrown from a function, but it is not caught. | CWE-306: Missing Authentication for Critical Functionality - The product does not perform any authenticati...
📊 ENRICHISSEMENT 01/04/2026 06:02
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-248: Uncaught Exception - An exception is thrown from a function, but it is not caught. | CWE-306: Missing Authentication for Critical Function - The product does not perform any authentication fo...
Total des modifications: 2 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3g9h-9hp4-654v
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