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all: use case-sensitive JSON unmarshaling (#807)

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As reported in
https://github.com/modelcontextprotocol/go-sdk/issues/805, case
insensitive unmarshaling can pose security issues. This change adjusts
all non-test and non-example unmarshaling to use a case sensitive mode.

This introduces a new external dependency
`github.com/segmentio/encoding`.
This commit is contained in:
Maciej Kisiel 2026-02-18 16:38:36 +01:00 • committed by Maciek Kisiel
commit 6e8ca568e4
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1 changed files with 127 additions and 20 deletions
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3
mcp/tool.go
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@ -11,6 +11,7 @@ import (
"strings"
"github.com/google/jsonschema-go/jsonschema"
internaljson "github.com/modelcontextprotocol/go-sdk/internal/json"
)
// A ToolHandler handles a call to tools/call.
@ -83,7 +84,7 @@ func applySchema(data json.RawMessage, resolved *jsonschema.Resolved) (json.RawM
if resolved != nil {
v := make(map[string]any)
if len(data) > 0 {
if err := json.Unmarshal(data, &v); err != nil {
if err := internaljson.Unmarshal(data, &v); err != nil {
return nil, fmt.Errorf("unmarshaling arguments: %w", err)
}
}