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CVE-2026-40245

Free5GC: UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication

7.5 High

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions 4.2.1 and below contain an information disclosure vulnerability in the UDR (Unified Data Repository) service. The handler for GET /nudr-dr/v2/application-data/influenceData/subs-to-notify sends an HTTP 400 error response when required query parameters are missing but does not return afterward. Execution continues into the processor function, which queries the data repository and appends the full list of Traffic Influence Subscriptions, including SUPI/IMSI values, to the response body. An unauthenticated attacker with network access to the 5G Service Based Interface can retrieve stored subscriber identifiers with a single parameterless HTTP GET request. The SUPI is the most sensitive subscriber identifier in 5G networks, and its exposure undermines the privacy guarantees of the 3GPP SUCI concealment mechanism at the core network level. A similar bypass exists when sending a malformed snssai parameter due to the same missing return pattern.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.51%Up 0.4 points since Apr 16, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

Free5GC: UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions 4.2.1 and below contain an information disclosure vulnerability in the UDR (Unified Data Repository) service. The handler for GET /nudr-dr/v2/application-data/influenceData/subs-to-notify sends an HTTP 400 error response when required query parameters are missing but does not return afterward. Execution continues into the processor function, which queries the data repository and appends the full list of Traffic Influence Subscriptions, including SUPI/IMSI values, to the response body. An unauthenticated attacker with network access to the 5G Service Based Interface can retrieve stored subscriber identifiers with a single parameterless HTTP GET request. The SUPI is the most sensitive subscriber identifier in 5G networks, and its exposure undermines the privacy guarantees of the 3GPP SUCI concealment mechanism at the core network level. A similar bypass exists when sending a malformed snssai parameter due to the same missing return pattern.

Record
CVE-2026-40245
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200, CWE-202, CWE-209
Updated
2026-11-02
EUVDEUVD-2026-23133 7.5

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions 4.2.1 and below contain an information disclosure vulnerability in the UDR (Unified Data Repository) service. The handler for GET /nudr-dr/v2/application-data/influenceData/subs-to-notify sends an HTTP 400 error response when required query parameters are missing but does not return afterward. Execution continues into the processor function, which queries the data repository and appends the full list of Traffic Influence Subscriptions, including SUPI/IMSI values, to the response body. An unauthenticated attacker with network access to the 5G Service Based Interface can retrieve stored subscriber identifiers with a single parameterless HTTP GET request. The SUPI is the most sensitive subscriber identifier in 5G networks, and its exposure undermines the privacy guarantees of the 3GPP SUCI concealment mechanism at the core network level. A similar bypass exists when sending a malformed snssai parameter due to the same missing return pattern.

Record
EUVD-2026-23133
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-wrwh-rpq4-87hf 7.5

free5gc UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication

Summary

An information disclosure vulnerability in the UDR service allows any unauthenticated attacker with access to the 5G Service Based Interface (SBI) to retrieve stored subscriber identifiers (SUPI/IMSI) with a single HTTP GET request requiring no parameters or credentials.

Details

The endpoint GET /nudr-dr/v2/application-data/influenceData/subs-to-notify (defined in 3GPP TS 29.519) requires at least one query parameter (dnns, snssais, supis, or internalGroupIds) to filter results.

In the free5GC UDR implementation, the input validation is present but ineffective because the handler does not return after sending the HTTP 400 error. The request handling flow is:

  1. The function HandleApplicationDataInfluenceDataSubsToNotifyGet in ./free5gc_4-2-1/free5gc/NFs/udr/internal/sbi/api_datarepository.go (around line 2793) checks whether all of dnn, snssai, internalGroupId, and supi are empty.
  2. If they are all empty, it builds a problemDetails structure and calls c.JSON(http.StatusBadRequest, problemDetails) to send a 400 response, but it does not return afterwards.
  3. Execution continues and the handler still calls s.Processor().ApplicationDataInfluenceDataSubsToNotifyGetProcedure(c, dnn,snssai, internalGroupId, supi) defined in ./free5gc_4-2-1/free5gc/NFs/udr/internal/sbi/processor/influence_data_subscriptions_collection.go.
  4. This processor function queries the data repository and writes the full list of Traffic Influence Subscriptions to the HTTP response body, including supis fields with SUPI/IMSI values.

As a result, a request without any query parameters produces a response where the HTTP status is 400 Bad Request, but the body contains both the error object and the full subscription list.

The missing return after sending the 400 response in api_datarepository.go is the root cause of this vulnerability.

PoC

No authentication, no prior knowledge of any subscriber identifier required.

curl -v "http://<udr-host>/nudr-dr/v2/application-data/influenceData/subs-to-notify"

Response (HTTP 400):

{"status":400,"detail":"At least one of DNNs, S-NSSAIs, Internal Group IDs or SUPIs shall be provided"}
[{"dnns":["internet"],
  "snssais":[{"sst":1,"sd":"000001"}],
  "supis":["imsi-222777483957498"],
  "notificationUri":"http://pcf.../npcf-callback/v1/nudr-notify/influence-data/imsi-222777483957498/1"}]

Impact

This is an unauthenticated information disclosure vulnerability. Any attacker with network access to the SBI (Service Based Interface) can enumerate SUPIs (Subscriber Permanent Identifiers / IMSI values) of registered users without any credentials or prior knowledge.

In a 5G network, the SUPI is the most sensitive subscriber identifier — its exposure breaks the privacy guarantees introduced by 3GPP with the SUCI (Subscription Concealed Identifier) mechanism, designed specifically to prevent SUPI tracking over the air. This vulnerability completely undermines that protection at the core network level.

Impacted deployments: any free5GC instance where the SBI is reachable by untrusted parties (e.g., misconfigured network segmentation, rogue NF, or compromised internal host).

Note: an additional trigger exists — sending a malformed snssai parameter also bypasses validation due to a missing return after the deserialization error handler, producing the same information disclosure.

Patch

The vulnerability has been confirmed patched by adding the two missing return statements in NFs/udr/internal/sbi/api_datarepository.go, function HandleApplicationDataInfluenceDataSubsToNotifyGet:

  1. After the c.JSON(http.StatusBadRequest, problemDetails) call in the snssai deserialization error branch.
  2. After the c.JSON(http.StatusBadRequest, problemDetails) call in the empty parameters validation block.

With the patch applied, a request without any query parameters now correctly returns HTTP 400 with only the error message,…

Record
GHSA-wrwh-rpq4-87hf
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200, CWE-202, CWE-209
Updated
2026-11-02
NVD 7.5

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions 4.2.1 and below contain an information disclosure vulnerability in the UDR (Unified Data Repository) service. The handler for GET /nudr-dr/v2/application-data/influenceData/subs-to-notify sends an HTTP 400 error response when required query parameters are missing but does not return afterward. Execution continues into the processor function, which queries the data repository and appends the full list of Traffic Influence Subscriptions, including SUPI/IMSI values, to the response body. An unauthenticated attacker with network access to the 5G Service Based Interface can retrieve stored subscriber identifiers with a single parameterless HTTP GET request. The SUPI is the most sensitive subscriber identifier in 5G networks, and its exposure undermines the privacy guarantees of the 3GPP SUCI concealment mechanism at the core network level. A similar bypass exists when sending a malformed snssai parameter due to the same missing return pattern.

Record
CVE-2026-40245
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200, CWE-202, CWE-209
Updated
2026-11-02
OSV 7.5

Free5GC: UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions 4.2.1 and below contain an information disclosure vulnerability in the UDR (Unified Data Repository) service. The handler for GET /nudr-dr/v2/application-data/influenceData/subs-to-notify sends an HTTP 400 error response when required query parameters are missing but does not return afterward. Execution continues into the processor function, which queries the data repository and appends the full list of Traffic Influence Subscriptions, including SUPI/IMSI values, to the response body. An unauthenticated attacker with network access to the 5G Service Based Interface can retrieve stored subscriber identifiers with a single parameterless HTTP GET request. The SUPI is the most sensitive subscriber identifier in 5G networks, and its exposure undermines the privacy guarantees of the 3GPP SUCI concealment mechanism at the core network level. A similar bypass exists when sending a malformed snssai parameter due to the same missing return pattern.

Record
CVE-2026-40245
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200, CWE-202, CWE-209
Updated
2026-11-02
OSVGHSA-wrwh-rpq4-87hf 7.5

free5gc UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication

Summary

An information disclosure vulnerability in the UDR service allows any unauthenticated attacker with access to the 5G Service Based Interface (SBI) to retrieve stored subscriber identifiers (SUPI/IMSI) with a single HTTP GET request requiring no parameters or credentials.

Details

The endpoint GET /nudr-dr/v2/application-data/influenceData/subs-to-notify (defined in 3GPP TS 29.519) requires at least one query parameter (dnns, snssais, supis, or internalGroupIds) to filter results.

In the free5GC UDR implementation, the input validation is present but ineffective because the handler does not return after sending the HTTP 400 error. The request handling flow is:

  1. The function HandleApplicationDataInfluenceDataSubsToNotifyGet in ./free5gc_4-2-1/free5gc/NFs/udr/internal/sbi/api_datarepository.go (around line 2793) checks whether all of dnn, snssai, internalGroupId, and supi are empty.
  2. If they are all empty, it builds a problemDetails structure and calls c.JSON(http.StatusBadRequest, problemDetails) to send a 400 response, but it does not return afterwards.
  3. Execution continues and the handler still calls s.Processor().ApplicationDataInfluenceDataSubsToNotifyGetProcedure(c, dnn,snssai, internalGroupId, supi) defined in ./free5gc_4-2-1/free5gc/NFs/udr/internal/sbi/processor/influence_data_subscriptions_collection.go.
  4. This processor function queries the data repository and writes the full list of Traffic Influence Subscriptions to the HTTP response body, including supis fields with SUPI/IMSI values.

As a result, a request without any query parameters produces a response where the HTTP status is 400 Bad Request, but the body contains both the error object and the full subscription list.

The missing return after sending the 400 response in api_datarepository.go is the root cause of this vulnerability.

PoC

No authentication, no prior knowledge of any subscriber identifier required.

curl -v "http://<udr-host>/nudr-dr/v2/application-data/influenceData/subs-to-notify"

Response (HTTP 400):

{"status":400,"detail":"At least one of DNNs, S-NSSAIs, Internal Group IDs or SUPIs shall be provided"}
[{"dnns":["internet"],
  "snssais":[{"sst":1,"sd":"000001"}],
  "supis":["imsi-222777483957498"],
  "notificationUri":"http://pcf.../npcf-callback/v1/nudr-notify/influence-data/imsi-222777483957498/1"}]

Impact

This is an unauthenticated information disclosure vulnerability. Any attacker with network access to the SBI (Service Based Interface) can enumerate SUPIs (Subscriber Permanent Identifiers / IMSI values) of registered users without any credentials or prior knowledge.

In a 5G network, the SUPI is the most sensitive subscriber identifier — its exposure breaks the privacy guarantees introduced by 3GPP with the SUCI (Subscription Concealed Identifier) mechanism, designed specifically to prevent SUPI tracking over the air. This vulnerability completely undermines that protection at the core network level.

Impacted deployments: any free5GC instance where the SBI is reachable by untrusted parties (e.g., misconfigured network segmentation, rogue NF, or compromised internal host).

Note: an additional trigger exists — sending a malformed snssai parameter also bypasses validation due to a missing return after the deserialization error handler, producing the same information disclosure.

Patch

The vulnerability has been confirmed patched by adding the two missing return statements in NFs/udr/internal/sbi/api_datarepository.go, function HandleApplicationDataInfluenceDataSubsToNotifyGet:

  1. After the c.JSON(http.StatusBadRequest, problemDetails) call in the snssai deserialization error branch.
  2. After the c.JSON(http.StatusBadRequest, problemDetails) call in the empty parameters validation block.

With the patch applied, a request without any query parameters now correctly returns HTTP 400 with only the error message,…

Record
GHSA-wrwh-rpq4-87hf
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200, CWE-202, CWE-209
Updated
2026-11-02
OSVGO-2026-5722 No score

free5gc UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication in github.com/free5gc/udr

free5gc UDR nudr-dr influenceData/subs-to-notify leaks SUPI in error response body without authentication in github.com/free5gc/udr

Record
GO-2026-5722
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/free5gc/udr
Go
 through 1.4.2 None known
github.com/free5gc/udr
Go
 All versions None known
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40245 is a high vulnerability (CVSS 7.5) in Free5gc, published April 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. No source names a fixed version.

References

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