# CVE-2026-37231: EURECOM FlexRIC denial of service via xapp_id integer wraparound

Source: https://junglewise.ai/threats/cve-2026-37231-eurecom-flexric-denial-of-service-via-xapp-id-integer-wraparound  
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-2026-37231 · Severity: info · CVSS 7.5 · Published 2026-06-01

FlexRIC, a controller used in Open RAN cellular networks to manage radio applications (xApps), is vulnerable to a denial-of-service attack. An attacker can repeatedly request new application registrations, causing an internal counter to overflow and produce duplicate identification numbers. When the system attempts to register a duplicate ID, the controller crashes, potentially disrupting cellular network management and operations.

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

## Quick answers

**Is CVE-2026-37231 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-37231 being exploited in the wild.

**How severe is CVE-2026-37231?** Informational severity, with a CVSS score of 7.5, published 1 June 2026.

**Which products and versions are affected?** EURECOM FlexRIC 2.0.0 through commit 6a595d8b.

**Is there a fix for CVE-2026-37231?** 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-2026-37231 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-37231?** 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

FlexRIC v2.0.0 (and versions through commit 6a595d8b) contains an integer truncation and wraparound vulnerability in the iApp component. While the internal counter for xapp_id is stored in a 32-bit field, it is assigned using a 16-bit logic that wraps around after approximately 65,530 E42_SETUP_REQUEST messages. A remote attacker can trigger this by repeatedly sending setup requests over SCTP to port 36422. When the counter wraps and generates a duplicate ID, the iApp process hits a uniqueness assertion in map_xapps_sockaddr.c and aborts, resulting in a complete denial of service. No official patch was available at the time of the advisory.

## Affected products

- EURECOM FlexRIC 2.0.0 through commit 6a595d8b

## Timeline

- 2026-06-01: disclosed
- 2026-06-01: advisory

## References

- [https://github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/advisories/CVE-2026-37231.md](https://github.com/MinamiKotor1/oran-security-advisories-zhongnan-luo/blob/main/advisories/CVE-2026-37231.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 NULL pointer dereference in near-RT RIC](https://junglewise.ai/threats/cve-2026-37230-eurecom-flexric-null-pointer-dereference-in-near-rt-ric)
- [EURECOM FlexRIC reachable assertion in e2ap_create_pdu](https://junglewise.ai/threats/cve-2026-37229-eurecom-flexric-reachable-assertion-in-e2ap-create-pdu)