How severe is CVE-2026-37235?

CVE-2026-37235 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 none, integrity none, and availability high.

Is CVE-2026-37235 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-37235?

CVE-2026-37235 affects Mosaic5g Flexric. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-37235?

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-2026-37235 have an EU (EUVD) identifier?

Yes. CVE-2026-37235 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33868.

When was CVE-2026-37235 published?

CVE-2026-37235 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-37235

CVE-2026-37235 is a high-severity vulnerability in Mosaic5g Flexric 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-284.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33868
Weakness: CWE-284
Affected product: Mosaic5g Flexric
Published: 2026-06-01
Last modified: 2026-06-17

Description

FlexRIC v2.0.0 trusts the xapp_id field from E42 message payloads without binding it to the sender's SCTP association. The validation function valid_xapp_id() only checks that the value is within the assigned range. A remote unauthenticated attacker can impersonate any xApp by specifying their xapp_id in requests sent to the iApp (port 36422), causing responses to be misrouted to the victim xApp. This can crash the victim xApp, the RIC, or the iApp itself through state inconsistencies in the red-black tree data structure.

Frequently asked questions

What is CVE-2026-37235?: FlexRIC v2.0.0 trusts the xapp_id field from E42 message payloads without binding it to the sender's SCTP association. The validation function valid_xapp_id() only checks that the value is within the assigned range. A remote unauthenticated attacker can impersonate any xApp by specifying their xapp_id in requests sent to the iApp (port 36422), causing responses to be misrouted to the victim xApp. This can crash the victim xApp, the RIC, or the iApp itself through state inconsistencies in the red-black tree data structure.
How severe is CVE-2026-37235?: CVE-2026-37235 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 none, integrity none, and availability high.
Is CVE-2026-37235 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-37235?: CVE-2026-37235 affects Mosaic5g Flexric. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-37235?: 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-2026-37235 have an EU (EUVD) identifier?: Yes. CVE-2026-37235 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33868.
When was CVE-2026-37235 published?: CVE-2026-37235 was published on 2026-06-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mosaic5g:flexric:2.0.0:*:*:*:*:*:*:*

More vulnerabilities in Mosaic5g Flexric

CVE-2026-37234 — High (CVSS 8.2): FlexRIC v2.0.0 allows a single SCTP connection to bind multiple xapp_ids by sending multiple E42_SETUP_REQUESTs. On…
CVE-2026-37233 — High (CVSS 7.5): FlexRIC v2.0.0 contains an authorization bypass in the iApp's xApp isolation mechanism. The equality function…
CVE-2026-37231 — High (CVSS 7.5): FlexRIC v2.0.0 uses a uint16_t counter for xapp_id assignment but stores the value in uint32_t message fields. After…
CVE-2026-37230 — High (CVSS 7.5): FlexRIC v2.0.0 crashes when the near-RT RIC receives a RIC_INDICATION message with a ran_func_id that does not exist in…
CVE-2026-37229 — High (CVSS 7.5): FlexRIC v2.0.0 contains a reachable assertion in e2ap_create_pdu() triggered when ASN.1 PER decoding fails. A remote…
CVE-2026-37228 — High (CVSS 7.5): FlexRIC v2.0.0 contains a reachable assertion in e2ap_recv_sctp_msg() (src/lib/ep/e2ap_ep.c). The function allocates a…

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