---
id: CVE-2026-122992
title: >-
  In G4KLX DStarGateway and F4FXL DStarGateway before 7b75de6,
  dstarCallsignToAPRS in APRSUtils.cpp has an integer underflow via an empty
  RS-MS1A sender field.
summary: >-
  In G4KLX DStarGateway and F4FXL DStarGateway before 7b75de6,
  dstarCallsignToAPRS in APRSUtils.cpp has an integer underflow via an empty
  RS-MS1A sender field.
severity: critical
cvss: 9.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H'
cvssSource: cna
cwe:
  - CWE-191
vendor: G4KLX
product: DStarGateway
affected:
  - >-
    DStarGateway >= bd3b8650c41d3537c2af1d2d32dcb5b9f2a1a754 <
    7b75de605dca542a2953dd74c16f0eac96a8944e
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T02:36:35.657Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-122992'
references:
  - url: 'https://github.com/g4klx/DStarGateway'
  - url: 'https://github.com/F4FXL/DStarGateway/pull/71'
  - url: >-
      https://github.com/F4FXL/DStarGateway/blob/7b75de605dca542a2953dd74c16f0eac96a8944e/README.md?plain=1#L159-L161
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.693Z'
epss: 0.00318
epssPercentile: 0.24936
---

## Overview

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

## Affected

- `DStarGateway >= bd3b8650c41d3537c2af1d2d32dcb5b9f2a1a754 < 7b75de605dca542a2953dd74c16f0eac96a8944e`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.