> CVE-2026-67430 [MEDIUM]

« BACK_TO_HOME
PUBLISHED
2026-07-29 20:17
MODIFIED
2026-07-29 20:17
CVSS_SCORE V3
5.3
EPSS (Prob. Exploit)
0.37%
Top 69.5%
DATA SOURCES:
NVD đź”— 2026-07-29 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 GITHUB đź”— 2026-10-29 OSV đź”— 2026-10-26

> DESCRIPTION

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StreamableHTTPTransport in the mcp gem does not expire sessions by default, so repeated initialize requests retain unbounded ServerSession objects and can exhaust process memory. This issue is fixed in version 0.23.0.

> 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:L
EXPLOITABILITY
3.9
IMPACT
1.4

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

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

> WEAKNESSES

CWE-401 CWE-770

> CWE DETAILED DESCRIPTIONS

CWE-401: Missing Release of Memory after Effective Lifetime - The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse. | CWE-770: Allocation of Resources Without Limits or Throttling - The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

> GITHUB SECURITY ADVISORY

GHSA-52jp-gj8w-j6xh MODERATE

MCP Ruby SDK: Unbounded session retention in StreamableHTTPTransport allows memory exhaustion via initialize flood

AFFECTED PACKAGES:
RUBYGEMS / mcp
<= 0.22.0
Fixed in: 0.23.0

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

MCP Ruby SDK: Unbounded session retention in StreamableHTTPTransport allows memory exhaustion via initialize flood

AFFECTED PACKAGES:
Unknown / Unknown
25 versions affected
ALIASES:
GHSA-52jp-gj8w-j6xh

> HISTORIQUE DES MODIFICATIONS

Première apparition
29/07/2026 20:17
Source: NVD
đź“Š ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-401: Missing Release of Memory after Effective Lifetime - The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocatio...
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/modelcontextprotocol/ruby-sdk/commit/afb968c468c178c4d3294b42...
https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0
https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-52jp-g...
« BACK_TO_HOME