How severe is CVE-2026-2521?

CVE-2026-2521 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-2521 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2521?

CVE-2026-2521 affects Open5gs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2521?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-2521 have an EU (EUVD) identifier?

Yes. CVE-2026-2521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6141.

When was CVE-2026-2521 published?

CVE-2026-2521 was published on 2026-02-15 and last updated on 2026-06-17.

CVE-2026-2521

CVE-2026-2521 is a medium-severity vulnerability in Open5gs with a CVSS 3.x base score of 5.3. 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-119.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
CVSS v4: 5.5
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6141
Weakness: CWE-119
Affected product: Open5gs
Published: 2026-02-15
Last modified: 2026-06-17

Description

A weakness has been identified in Open5GS up to 2.7.6. This issue affects the function sgwc_s5c_handle_create_session_response of the component SGW-C. Executing a manipulation can lead to memory corruption. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

Frequently asked questions

What is CVE-2026-2521?: A weakness has been identified in Open5GS up to 2.7.6. This issue affects the function sgwc_s5c_handle_create_session_response of the component SGW-C. Executing a manipulation can lead to memory corruption. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
How severe is CVE-2026-2521?: CVE-2026-2521 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-2521 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2521?: CVE-2026-2521 affects Open5gs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2521?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-2521 have an EU (EUVD) identifier?: Yes. CVE-2026-2521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6141.
When was CVE-2026-2521 published?: CVE-2026-2521 was published on 2026-02-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*

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