How severe is CVE-2026-37229?

CVE-2026-37229 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-2026-37229 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-37229?

CVE-2026-37229 affects Mosaic5g Flexric. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-37229?

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-2026-37229 have an EU (EUVD) identifier?

Yes. CVE-2026-37229 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33862.

When was CVE-2026-37229 published?

CVE-2026-37229 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-37229

CVE-2026-37229 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-617.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33862
Weakness: CWE-617
Affected product: Mosaic5g Flexric
Published: 2026-06-01
Last modified: 2026-06-17

Description

FlexRIC v2.0.0 contains a reachable assertion in e2ap_create_pdu() triggered when ASN.1 PER decoding fails. A remote unauthenticated attacker can send any non-PER byte sequence (e.g., a single 0x00 byte) over SCTP to the near-RT RIC (port 36421) or iApp (port 36422) to crash the process via SIGABRT. The assertion is reached before any protocol-level validation occurs. All three E2AP protocol versions (v1.01, v2.03, v3.01) are affected.

Frequently asked questions

What is CVE-2026-37229?: FlexRIC v2.0.0 contains a reachable assertion in e2ap_create_pdu() triggered when ASN.1 PER decoding fails. A remote unauthenticated attacker can send any non-PER byte sequence (e.g., a single 0x00 byte) over SCTP to the near-RT RIC (port 36421) or iApp (port 36422) to crash the process via SIGABRT. The assertion is reached before any protocol-level validation occurs. All three E2AP protocol versions (v1.01, v2.03, v3.01) are affected.
How severe is CVE-2026-37229?: CVE-2026-37229 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-2026-37229 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-37229?: CVE-2026-37229 affects Mosaic5g Flexric. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-37229?: 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-2026-37229 have an EU (EUVD) identifier?: Yes. CVE-2026-37229 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33862.
When was CVE-2026-37229 published?: CVE-2026-37229 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-2026-37235 — High (CVSS 7.5): FlexRIC v2.0.0 trusts the xapp_id field from E42 message payloads without binding it to the sender's SCTP association.…
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-2026-37228 — 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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