Description
free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the service reliably leaks detailed internal error messages (e.g., strconv.ParseInt parsing errors) to remote clients when processing invalid pduSessionId inputs. This exposes implementation details and can be used for service fingerprinting. All deployments of free5GC using the UDM Nudm_UECM DELETE service may be vulnerable. free5gc/udm pull request 76 contains a fix for the issue. No direct workaround is available at the application level. Applying the official patch is recommended.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_confirm
https://github.com/free5gc/free5gc/security/advisories/GHSA-6w77-5pqh-83rm
Issue Tracking x_refsource_misc
https://github.com/free5gc/free5gc/issues/750
Issue Tracking x_refsource_misc
https://github.com/free5gc/udm/pull/76
Patch x_refsource_misc
https://github.com/free5gc/udm/commit/504b14458d156558b3c0ade7107b86b3d5e72998
Scores
CVSS v3
7.5
EPSS
0.0040
EPSS Percentile
31.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-754
CWE-20
Status
published
Products (1)
free5gc/udm
< 1.4.1
Published
Feb 24, 2026
Tracked Since
Feb 24, 2026