---
id: "CVE-2026-104598"
kind: "vulnerability"
aliases: ["CVE-2026-104598"]
title: "libosmo-sigtran: out-of-bounds read in M3UA NOTIFY decoder leaks data"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["osmocom", "other", "self-hosted", "sigtran", "telecom"]
not_affected_if: ["no-m3ua-listener"]
published_at: "2026-10-26T20:17:37+00:00"
first_seen_at: "2026-10-26T20:50:17+00:00"
updated_at: "2026-10-26T20:52:01+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104598", "first_seen_at": "2026-10-26T20:50:17+00:00"}]
---

# libosmo-sigtran: out-of-bounds read in M3UA NOTIFY decoder leaks data

libosmo-sigtran through 2.2.1 has an out-of-bounds read in the M3UA NOTIFY message decoder in src/m3ua.c. A remote attacker sending a crafted NOTIFY message can read memory beyond the buffer and obtain sensitive information.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed libosmo-sigtran version with `pkg-config --modversion libosmo-sigtran` or the package manager, and compare it to `2.2.1`
- unknown whether other check methods are needed; the sources do not say

## Fix

- Move libosmo-sigtran past `2.2.1` once a fixed release is published; the sources do not name a fixed version
- unknown whether a patch or commit exists; the sources do not say

## Timeline

- 2026-10-26T20:50:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-104598

## From the sources

libosmo-sigtran through 2.2.1 contains an out-of-bounds read in the M3UA NOTIFY decoder in src/m3ua.c. This allows a remote attacker to obtain sensitive information.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_