CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката може да се автоматизира
Описание
Оригинално описание
The Go MCP SDK used Go's standard encoding/json.Unmarshal for JSON-RPC and MCP protocol message parsing in versions prior to 1.3.1. Go's standard library performs case-insensitive matching of JSON keys to struct field tags — a field tagged json:"method" would also match "Method", "METHOD", etc. This violated the JSON-RPC 2.0 specification, which defines exact field names. A malicious MCP peer may have been able to send protocol messages with non-standard field casing that the SDK would silently accept. This had the potential for bypassing intermediary inspection and coss-implementation inconsistency. Go's standard JSON unmarshaling was replaced with a case-sensitive decoder in commit 7b8d81c. Users are advised to update to v1.3.1 to resolve this issue.
Засегнати продукти
- modelcontextprotocol go-sdk: < 1.3.1
- Red Hat Migration Toolkit for Virtualization
- Red Hat OpenShift Lightspeed
- Red Hat OpenShift Serverless
- Red Hat Red Hat OpenShift AI (RHOAI)
Вид слабост
История
- 26 февруари 2026 Публикувано
Други уязвимости в modelcontextprotocol go-sdk
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-27896
- https://nvd.nist.gov/vuln/detail/CVE-2026-27896
- https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-wvj2-96wp-fq3f
- https://github.com/modelcontextprotocol/go-sdk/commit/7b8d81c264074404abdf5aa16e2cf0c2d9c64cc0
- https://access.redhat.com/security/cve/CVE-2026-27896
- https://bugzilla.redhat.com/show_bug.cgi?id=2442903
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27896.json