---
id: "CVE-2026-122992"
kind: "vulnerability"
aliases: ["CVE-2026-122992"]
title: "DStarGateway: integer underflow in APRS callsign parsing from empty field"
severity: "critical"
cvss: 9.2
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["amateur-radio", "d-star", "dstargateway", "package"]
not_affected_if: ["unknown"]
published_at: "2026-11-05T03:17:25+00:00"
first_seen_at: "2026-11-05T03:31:42+00:00"
updated_at: "2026-11-05T03:33:07+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-122992", "first_seen_at": "2026-11-05T03:31:42+00:00"}]
exploit_sources: []
---

# DStarGateway: integer underflow in APRS callsign parsing from empty field

DStarGateway, a D-STAR amateur radio gateway, has an integer underflow in dstarCallsignToAPRS when the RS-MS1A sender field is empty. The sources do not state what an attacker can achieve beyond the memory corruption this implies.

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

## How to check

- Check whether DStarGateway from G4KLX or F4FXL is installed, and its version, against the fixed commit `7b75de6`
- Look for the RS-MS1A sender handling in APRSUtils.cpp

## Fix

- Move to a DStarGateway build that includes commit `7b75de6`

## Timeline

- 2026-11-05T03:31:42+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-122992

## From the sources

In G4KLX DStarGateway and F4FXL DStarGateway before 7b75de6, dstarCallsignToAPRS in APRSUtils.cpp has an integer underflow via an empty RS-MS1A sender field.

---

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