…2.4.0 [security] (open-feature#1784)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[github.com/go-viper/mapstructure/v2](https://redirect.github.com/go-viper/mapstructure)
| `v2.3.0` -> `v2.4.0` |
[![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgo-viper%2fmapstructure%2fv2/v2.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgo-viper%2fmapstructure%2fv2/v2.3.0/v2.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

### GitHub Vulnerability Alerts

####
[GHSA-2464-8j7c-4cjm](https://redirect.github.com/go-viper/mapstructure/security/advisories/GHSA-2464-8j7c-4cjm)

### Summary

Use of this library in a security-critical context may result in leaking
sensitive information, if used to process sensitive fields.

### Details

OpenBao (and presumably HashiCorp Vault) have surfaced error messages
from `mapstructure` as follows:

https://github.com/openbao/openbao/blob/98c3a59c040efca724353ca46ca79bd5cdbab920/sdk/framework/field_data.go#L43-L50

```go
			_, _, err := d.getPrimitive(field, schema)
			if err != nil {
				return fmt.Errorf("error converting input for field %q: %w", field, err)
			}
```

where this calls `mapstructure.WeakDecode(...)`:
https://github.com/openbao/openbao/blob/98c3a59c040efca724353ca46ca79bd5cdbab920/sdk/framework/field_data.go#L181-L193

```go

func (d *FieldData) getPrimitive(k string, schema *FieldSchema) (interface{}, bool, error) {
	raw, ok := d.Raw[k]
	if !ok {
		return nil, false, nil
	}

	switch t := schema.Type; t {
	case TypeBool:
		var result bool
		if err := mapstructure.WeakDecode(raw, &result); err != nil {
			return nil, false, err
		}
		return result, true, nil
```

Notably, `WeakDecode(...)` eventually calls one of the decode helpers,
which surfaces the original value via `strconv` helpers:

https://github.com/go-viper/mapstructure/blob/8c61ec1924fcfa522f9fc6b4618c672db61d1a38/mapstructure.go#L720-L727

https://github.com/go-viper/mapstructure/blob/8c61ec1924fcfa522f9fc6b4618c672db61d1a38/mapstructure.go#L791-L798

https://github.com/go-viper/mapstructure/blob/8c61ec1924fcfa522f9fc6b4618c672db61d1a38/decode_hooks.go#L180

& more. These are different code paths than are fixed in the previous
iteration at
GHSA-fv92-fjc5-jj9h.

### PoC

To reproduce with OpenBao:

```
$ podman run --pull=always -p 8300:8300 openbao/openbao:latest server -dev -dev-root-token-id=root -dev-listen-address=0.0.0.0:8300
```

and in a new tab:

```
$ BAO_TOKEN=root BAO_ADDR=http://localhost:8300 bao auth enable userpass
Success! Enabled userpass auth method at: userpass/
$ curl -X PUT -H "X-Vault-Request: true" -H "X-Vault-Token: root" -d '{"ttl":"asdf"}' "http://localhost:8200/v1/auth/userpass/users/asdf"

--> server logs:

2025-06-25T21:32:25.101-0500 [ERROR] core: failed to run existence check: error="error converting input for field \"ttl\": time: invalid duration \"asdf\""
```

### Impact

This is an information disclosure bug with little mitigation. See
https://discuss.hashicorp.com/t/hcsec-2025-09-vault-may-expose-sensitive-information-in-error-logs-when-processing-malformed-data-with-the-kv-v2-plugin/74717
for a previous version. That version was fixed, but this is in the
second part of that error message (starting at `'' expected a map, got
'string'` -- when the field type is `string` and a `map` is provided, we
see the above information leak -- the previous example had a `map` type
field with a `string` value provided).

This was rated 4.5 Medium by HashiCorp in the past iteration.

---

### Release Notes

<details>
<summary>go-viper/mapstructure
(github.com/go-viper/mapstructure/v2)</summary>

###
[`v2.4.0`](https://redirect.github.com/go-viper/mapstructure/releases/tag/v2.4.0)

[Compare
Source](https://redirect.github.com/go-viper/mapstructure/compare/v2.3.0...v2.4.0)

#### What's Changed

- refactor: replace interface{} with any by
[@&#8203;sagikazarmark](https://redirect.github.com/sagikazarmark) in
[https://github.com/go-viper/mapstructure/pull/115](https://redirect.github.com/go-viper/mapstructure/pull/115)
- build(deps): bump github/codeql-action from 3.29.0 to 3.29.2 by
[@&#8203;dependabot](https://redirect.github.com/dependabot)\[bot]
in[https://github.com/go-viper/mapstructure/pull/114](https://redirect.github.com/go-viper/mapstructure/pull/114)4
- Generic tests by
[@&#8203;sagikazarmark](https://redirect.github.com/sagikazarmark) in
[https://github.com/go-viper/mapstructure/pull/118](https://redirect.github.com/go-viper/mapstructure/pull/118)
- Fix godoc reference link in README.md by
[@&#8203;peczenyj](https://redirect.github.com/peczenyj) in
[https://github.com/go-viper/mapstructure/pull/107](https://redirect.github.com/go-viper/mapstructure/pull/107)
- feat: add StringToTimeLocationHookFunc to convert strings to
\*time.Location by
[@&#8203;ErfanMomeniii](https://redirect.github.com/ErfanMomeniii) in
[https://github.com/go-viper/mapstructure/pull/117](https://redirect.github.com/go-viper/mapstructure/pull/117)
- feat: add back previous StringToSlice as a weak function by
[@&#8203;sagikazarmark](https://redirect.github.com/sagikazarmark) in
[https://github.com/go-viper/mapstructure/pull/119](https://redirect.github.com/go-viper/mapstructure/pull/119)

#### New Contributors

- [@&#8203;ErfanMomeniii](https://redirect.github.com/ErfanMomeniii)
made their first contribution in
[https://github.com/go-viper/mapstructure/pull/117](https://redirect.github.com/go-viper/mapstructure/pull/117)

**Full Changelog**:
go-viper/mapstructure@v2.3.0...v2.4.0

</details>

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Signed-off-by: Todd Baert <todd.baert@dynatrace.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Todd Baert <todd.baert@dynatrace.com>
Signed-off-by: Giovanni Liva <giovanni.liva@dynatrace.com>

Signed-off-by: Simon Schrottner <simon.schrottner@dynatrace.com>
Signed-off-by: Giovanni Liva <giovanni.liva@dynatrace.com>

Signed-off-by: Todd Baert <todd.baert@dynatrace.com>