CVE-2026-27642
highpriority · track · 30EPSS 0.007 · 54 %ileEUUSEPSS · scored 2026-10-24
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, remote attackers can inject control characters (e.g., %00) into the supi parameter, triggering internal URL parsing errors (net/url: invalid control character). This exposes system-level error details and can be used for service fingerprinting. All deployments of free5GC using the UDM Nudm_UEAU service may be affected. free5gc/udm pull request 75 contains a fix for the issue. No direct workaround is available at the application level. Applying the official patch is recommended.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (13)
External citations — patches, advisories, analysis.
- https://github.com/free5gc/free5gc/issues/749cnnvd
- https://github.com/free5gc/free5gc/security/advisories/GHSA-h4wg-rp7m-8xx4cnnvd
- https://github.com/free5gc/udm/commit/a7af2321ddea6368c43835f90f6d1b9d67dd2ea1cnnvd
- https://github.com/free5gc/udm/pull/75cnnvd
- https://github.com/free5gc/udm/releasesPatchcnnvd
- https://github.com/free5gc/free5gc/issues/749enisa_euvd
- https://github.com/free5gc/free5gc/security/advisories/GHSA-h4wg-rp7m-8xx4enisa_euvd
- https://github.com/free5gc/udm/commit/a7af2321ddea6368c43835f90f6d1b9d67dd2ea1enisa_euvd
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