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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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4
mcp/util.go
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@ -7,6 +7,8 @@ package mcp
import (
"crypto/rand"
"encoding/json"
internaljson "github.com/modelcontextprotocol/go-sdk/internal/json"
)
func assert(cond bool, msg string) {
@ -36,7 +38,7 @@ func remarshal(from, to any) error {
if err != nil {
return err
}
if err := json.Unmarshal(data, to); err != nil {
if err := internaljson.Unmarshal(data, to); err != nil {
return err
}
return nil