How severe is CVE-2026-27642?

CVE-2026-27642 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-27642 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27642?

CVE-2026-27642 affects Free5gc Udm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27642?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-27642 have an EU (EUVD) identifier?

Yes. CVE-2026-27642 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7463.

When was CVE-2026-27642 published?

CVE-2026-27642 was published on 2026-02-24 and last updated on 2026-06-17.

CVE-2026-27642

CVE-2026-27642 is a high-severity vulnerability in Free5gc Udm with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 6.6
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7463
Weakness: CWE-20
Affected product: Free5gc Udm
Published: 2026-02-24
Last modified: 2026-06-17

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, 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.

Frequently asked questions

What is CVE-2026-27642?: 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.
How severe is CVE-2026-27642?: CVE-2026-27642 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-27642 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27642?: CVE-2026-27642 affects Free5gc Udm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27642?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-27642 have an EU (EUVD) identifier?: Yes. CVE-2026-27642 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7463.
When was CVE-2026-27642 published?: CVE-2026-27642 was published on 2026-02-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:free5gc:udm:*:*:*:*:*:go:*:*

More vulnerabilities in Free5gc Udm

CVE-2026-33191 — High (CVSS 8.6): Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to…
CVE-2026-33064 — High (CVSS 7.5): Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to…
CVE-2025-69252 — High (CVSS 7.5): free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile…
CVE-2025-69250 — High (CVSS 7.5): free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile…
CVE-2023-46324 — High (CVSS 7.5): pkg/suci/suci.go in free5GC udm before 1.2.0, when Go before 1.19 is used, allows an Invalid Curve Attack because it…
CVE-2026-33192 — Medium (CVSS 5.3): Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. In versions prior to…

All CVEs affecting Free5gc Udm →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →