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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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12
mcp/protocol.go
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@ -13,6 +13,8 @@ package mcp
import (
"encoding/json"
"fmt"
internaljson "github.com/modelcontextprotocol/go-sdk/internal/json"
)
// Optional annotations for the client. The client can use annotations to inform
@ -140,7 +142,7 @@ func (x *CallToolResult) UnmarshalJSON(data []byte) error {
res
Content []*wireContent `json:"content"`
}
if err := json.Unmarshal(data, &wire); err != nil {
if err := internaljson.Unmarshal(data, &wire); err != nil {
return err
}
var err error
@ -286,7 +288,7 @@ type CompleteReference struct {
func (r *CompleteReference) UnmarshalJSON(data []byte) error {
type wireCompleteReference CompleteReference // for naive unmarshaling
var r2 wireCompleteReference
if err := json.Unmarshal(data, &r2); err != nil {
if err := internaljson.Unmarshal(data, &r2); err != nil {
return err
}
switch r2.Type {
@ -402,7 +404,7 @@ func (r *CreateMessageResult) UnmarshalJSON(data []byte) error {
result
Content *wireContent `json:"content"`
}
if err := json.Unmarshal(data, &wire); err != nil {
if err := internaljson.Unmarshal(data, &wire); err != nil {
return err
}
var err error
@ -838,7 +840,7 @@ func (m *PromptMessage) UnmarshalJSON(data []byte) error {
msg
Content *wireContent `json:"content"`
}
if err := json.Unmarshal(data, &wire); err != nil {
if err := internaljson.Unmarshal(data, &wire); err != nil {
return err
}
var err error
@ -1014,7 +1016,7 @@ func (m *SamplingMessage) UnmarshalJSON(data []byte) error {
msg
Content *wireContent `json:"content"`
}
if err := json.Unmarshal(data, &wire); err != nil {
if err := internaljson.Unmarshal(data, &wire); err != nil {
return err
}
var err error