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    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.

    Published:Jun 1, 2026
    Last Modified:Jun 3, 2026
    EPS:Jun 1, 2026
    EPSS Score:0.00062
    CVSS Score:7.5

    Affected Products

    Vendor
    Mosaic5g
    Product
    Flexric

    Exploits

    https://github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/advisories/CVE-2026-37235.md

    Common Weakness Enumeration

    CWE-284 Improper Access Control

    Related CVEs

    CVE-2026-37226 (CVSS 7.5) — FlexRIC v2.0.0 crashes when the iApp receives an E42_RIC_SUBSCRIPTION_REQUEST referencing a non-existent E2 No…
    CVE-2026-37230 (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…
    CVE-2026-37220 (CVSS 7.5) — FlexRIC v2.0.0 crashes when an SCTP association is closed before an E2_SETUP_REQUEST is sent. The near-RT RIC …
    CVE-2026-37221 (CVSS 7.5) — FlexRIC v2.0.0 crashes when receiving a RIC_SUBSCRIPTION_RESPONSE with an unknown ric_id that has no correspon…
    CVE-2026-37222 (CVSS 7.5) — FlexRIC v2.0.0 uses hardcoded assertions to validate Information Element (IE) counts in decoded E2AP messages.…
    CVE-2026-37224 (CVSS 7.5) — FlexRIC v2.0.0 crashes when receiving a duplicate E2_SETUP_REQUEST from the same or spoofed E2 Node. The iApp …
    CVE-2026-37227 (CVSS 7.5) — FlexRIC v2.0.0 contains reachable assert(0) calls in stub message handlers for whitelisted but unimplemented E…
    CVE-2026-37223 (CVSS 7.5) — FlexRIC v2.0.0 contains a reachable assertion in the iApp message dispatcher. The dispatcher validates incomin…
    CVE-2026-37225 (CVSS 7.5) — FlexRIC v2.0.0 crashes when the iApp receives an E42_RIC_SUBSCRIPTION_REQUEST with an empty ricEventTriggerDef…
    CVE-2026-37228 (CVSS 7.5) — FlexRIC v2.0.0 contains a reachable assertion in e2ap_recv_sctp_msg() (src/lib/ep/e2ap_ep.c). The function all…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High