# CVE-2026-37228: EURECOM FlexRIC reachable assertion in e2ap_recv_sctp_msg

Source: https://junglewise.ai/threats/cve-2026-37228-eurecom-flexric-reachable-assertion-in-e2ap-recv-sctp-msg  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-01. Updated: 2026-06-01  
License: CC BY 4.0 with a link back

CVE-2026-37228 · Severity: info · CVSS 7.5 · Published 2026-06-01

EURECOM FlexRIC, a controller used in Open RAN (O-RAN) cellular networks to manage radio access functions, contains a flaw in how it handles incoming network messages. An unauthenticated remote attacker can send a single oversized network packet to crash critical components, including the near-RT RIC, E2 Agent, or xApps. This results in a denial-of-service condition that can disrupt cellular network operations and management.

Technologies: [EURECOM FlexRIC](https://junglewise.ai/threats/technologies/flexric). Vendors: [EURECOM](https://junglewise.ai/threats/vendors/eurecom).

## Quick answers

**Is CVE-2026-37228 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-37228 being exploited in the wild.

**How severe is CVE-2026-37228?** Informational severity, with a CVSS score of 7.5, published 1 June 2026.

**Which products and versions are affected?** EURECOM FlexRIC v2.0.0 through commit 6a595d8b (2025-11-12).

**Is there a fix for CVE-2026-37228?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-37228 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-37228?** Check whether you run EURECOM FlexRIC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A reachable assertion (CWE-617) exists in the `e2ap_recv_sctp_msg()` function within `src/lib/ep/e2ap_ep.c`. The function allocates a fixed 32KB receive buffer and performs an `assert(rc < len)` on the return value of `sctp_recvmsg()`. A remote, unauthenticated attacker can trigger this assertion by sending an SCTP message with a payload of 32,768 bytes or greater to ports 36421 or 36422. This causes a SIGABRT and process termination before any E2AP PDU validation occurs. In production builds where assertions are disabled (NDEBUG), this flaw may instead lead to a signed-to-unsigned integer overflow and potential out-of-bounds reads.

## Affected products

- EURECOM FlexRIC v2.0.0 through commit 6a595d8b (2025-11-12)

## Timeline

- 2026-06-01: advisory: NVD and researcher advisory published

## References

- [https://github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/advisories/CVE-2026-37228.md](https://github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/advisories/CVE-2026-37228.md)
- [https://gitlab.eurecom.fr/mosaic5g/flexric](https://gitlab.eurecom.fr/mosaic5g/flexric)

## Related threats

- [EURECOM FlexRIC resource leak via multiple xApp identity bindings](https://junglewise.ai/threats/cve-2026-37234-eurecom-flexric-resource-leak-via-multiple-xapp-identity-bindings)
- [EURECOM FlexRIC xApp impersonation and DoS in iApp component](https://junglewise.ai/threats/cve-2026-37235-eurecom-flexric-xapp-impersonation-and-dos-in-iapp-component)
- [EURECOM FlexRIC authorization bypass in iApp xApp isolation](https://junglewise.ai/threats/cve-2026-37233-eurecom-flexric-authorization-bypass-in-iapp-xapp-isolation)
- [EURECOM FlexRIC denial of service via xapp_id integer wraparound](https://junglewise.ai/threats/cve-2026-37231-eurecom-flexric-denial-of-service-via-xapp-id-integer-wraparound)
- [EURECOM FlexRIC NULL pointer dereference in near-RT RIC](https://junglewise.ai/threats/cve-2026-37230-eurecom-flexric-null-pointer-dereference-in-near-rt-ric)