> CVE-2026-55859 [MEDIUM]

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PUBLISHED
2026-08-28 23:17
MODIFIED
2026-08-28 23:17
CVSS_SCORE V3
5.9
EPSS (Prob. Exploit)
0.49%
Top 59.5%
DATA SOURCES:
NVD đź”— 2026-08-29 CWE MITRE đź”— 2026-09-01 FIRST EPSS đź”— 2026-10-18 GITHUB đź”— 2026-10-29 OSV đź”— 2026-10-26

> DESCRIPTION

MariaDB Connector/R2DBC is a non-blocking MariaDB and MySQL client implemented in Java. Prior to 1.4.1, org.mariadb:r2dbc-mariadb encodes and decodes all character data under the assumption that the connection character set is UTF-8. A server can announce a mid-session change to character_set_client through the OK-packet session-state-tracking mechanism, including through SET NAMES executed by a stored routine or trigger, server configuration, or a hostile or man-in-the-middle server. If the new character set is not UTF-8, the driver continues to exchange UTF-8 while the server interprets the same bytes under a different encoding, causing silent data corruption and a client/server charset-confusion mismatch that can defeat byte-wise quoting or escaping. The fix accepts only utf8, utf8mb3, or utf8mb4 after initialization; any other value raises R2dbcNonTransientResourceException with SQLState 08000 and closes the connection. This issue is fixed in version 1.4.1.

> 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:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EXPLOITABILITY
2.2
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
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
High (H)
Conditions spécifiques doivent être réunies 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
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-116 CWE-838

> CWE DETAILED DESCRIPTIONS

CWE-116: Improper Encoding or Escaping of Output - The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. | CWE-838: Inappropriate Encoding for Output Context - The product uses or specifies an encoding when generating output to a downstream component, but the specified encoding is not the same as the encoding that is expected by the downstream component.

> GITHUB SECURITY ADVISORY

GHSA-5rqc-86vf-g8r2 MODERATE

org.mariadb:r2dbc-mariadb has Inappropriate Encoding for Output Context and Improper Encoding or Escaping of Output

AFFECTED PACKAGES:
MAVEN / org.mariadb:r2dbc-mariadb
< 1.4.1
Fixed in: 1.4.1

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

MariaDB Connector/R2DBC: Inappropriate Encoding for Output Context and Improper Encoding or Escaping of Output in org.mariadb:r2dbc-mariadb

AFFECTED PACKAGES:
Unknown / Unknown
9 versions affected
ALIASES:
GHSA-5rqc-86vf-g8r2

> HISTORIQUE DES MODIFICATIONS

Première apparition
28/08/2026 23:17
Source: NVD
📊 ENRICHISSEMENT 01/09/2026 06:02
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-116: Improper Encoding or Escaping of Output - The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done in...
Total des modifications: 1 Dernière mise à jour: 1 month ago

> REFERENCES

https://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/38bad9afeb...
https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4....
https://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisori...
https://jira.mariadb.org/browse/R2DBC-124
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