# CVE-2026-100892: UERANSIM null pointer dereference in ULInformationTransfer handler

Source: https://junglewise.ai/threats/cve-2026-100892-a-vulnerability-was-found-in-aligungr-ueransim-up-to-3-3-0-this  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-100892 · Severity: medium · CVSS 5.3 · Published 2026-09-28

UERANSIM is a 5G radio access network simulator used for testing gNodeB (gNB) implementations. A flaw in the ULInformationTransfer message handler allows a remote attacker to send a crafted RLS message sequence that crashes the gNB process, causing denial of service and disrupting network simulation or testing activities. No authentication is required to trigger the crash.

Technologies: [Aligungr UERANSIM](https://junglewise.ai/threats/technologies/ueransim). Vendors: [Aligungr](https://junglewise.ai/threats/vendors/aligungr).

## Quick answers

**Is CVE-2026-100892 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100892 being exploited in the wild.

**How severe is CVE-2026-100892?** Medium severity, with a CVSS score of 5.3, published 28 September 2026.

**Which products and versions are affected?** Aligungr UERANSIM up to 3.3.0.

**Is there a fix for CVE-2026-100892?** 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-2026-100892 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-100892?** Check whether you run Aligungr UERANSIM 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 null pointer dereference vulnerability exists in the receiveUplinkInformationTransfer function within src/gnb/rrc/handler.cpp. When a malformed ULInformationTransfer message is received with a NULL dedicatedNASMessage field, the function dereferences this pointer without validation, triggering a SIGSEGV. The attack is network-initiated and requires no prior authentication, allowing remote denial of service of the nr-gnb component.

## Affected products

- aligungr UERANSIM up to 3.3.0

## Timeline

- 2026-09-28: disclosed: Vulnerability publicly disclosed on GitHub gist
- 2026-08-06: exploited: Proof of concept exploit demonstrated

## References

- [https://gist.github.com/centauruszzz/c69a6bd152f45d9ca8db981f7da34bed](https://gist.github.com/centauruszzz/c69a6bd152f45d9ca8db981f7da34bed)
- [https://vuldb.com/cve/CVE-2026-100892](https://vuldb.com/cve/CVE-2026-100892)

## Related threats

- [aligungr UERANSIM exception in NAS message parsing](https://junglewise.ai/threats/cve-2026-101035-a-flaw-has-been-found-in-aligungr-ueransim-up-to-3-3-0-this)
- [aligungr UERANSIM uncaught exception in Radio Link Simulation Layer](https://junglewise.ai/threats/cve-2026-7183-aligungr-ueransim-uncaught-exception-in-radio-link-simulation)