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CVE-2026-1990

oatpp Type.hpp ObjectWrapper null pointer dereference

A security vulnerability has been detected in oatpp up to 1.3.1. This impacts the function oatpp::data::type::ObjectWrapper::ObjectWrapper of the file src/oatpp/data/type/Type.hpp. The manipulation leads to null pointer dereference. Local access is required to approach this attack. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Oatpp
Products
Oatpp
CVE-2025-6515

Reuse of session IDs in oatpp-mcp leads to session hijacking and prompt hijacking by remote attackers

The MCP SSE endpoint in oatpp-mcp returns an instance pointer as the session ID, which is not unique nor cryptographically secure. This allows network attackers with access to the oatpp-mcp server to guess future session IDs and hijack legitimate client MCP sessions, returning malicious responses from the oatpp-mcp server.

CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed
Vendors
Oatpp
Products
Mcp
CVE-2025-6566

oatpp Oat++ Deserializer.cpp deserializeArray stack-based overflow

A vulnerability was found in oatpp Oat++ up to 1.3.1. It has been declared as critical. This vulnerability affects the function deserializeArray of the file src/oatpp/json/Deserializer.cpp. The manipulation leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Oatpp
Products
Oat\+\+