In G4KLX DStarGateway and F4FXL DStarGateway before 7b75de6, dstarCallsignToAPRS in APRSUtils.cpp has an integer underflow via an empty…
Affects G4KLX DStarGateway builds before commit 7b75de6 when an RS-MS1A message has an empty sender field. No vendor severity is given, and the fix is in commit 7b75de6.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Not reported
Do first: Workaround: The sources do not describe a workaround. The trigger is an empty sender field in RS-MS1A messages, so that is the input to watch until a build with commit 7b75de6 is in use.
- Last modified
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.32% · 24th percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 31/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The G4KLX and F4FXL DStarGateway software is affected by an integer underflow in its APRS callsign conversion code, triggered by an empty RS-MS1A sender field. An attacker can remotely, without logging in, crash the service or disrupt it, since the impact is high availability loss.
Read the original description
In G4KLX DStarGateway and F4FXL DStarGateway before 7b75de6, dstarCallsignToAPRS in APRSUtils.cpp has an integer underflow via an empty RS-MS1A sender field.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed, reachable over the network without a login · Unknown: Advisories don't say whether default setups are affected
- Reach?/20Unknown. No tracked technology or package matched
- Severity9.2/10CVSS 9.2
- No patch5/5No patch listed yet
What would change the score
- Would score about 76 if added to CISA KEV
- Would score about 71 if CISA's SSVC rates exploitation active
- Would score about 36 if advisories confirm default setups are exposed
What to do
Workaround: The sources do not describe a workaround. The trigger is an empty sender field in RS-MS1A messages, so that is the input to watch until a build with commit 7b75de6 is in use.
Timeline
- CVE published
- First seen by cve.now
- Posted on X by cve.now
Affected versions
- G4KLX DStarGateway
Version range not reported
Evidence 3
- Repository
- Repository
- Repository
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-122992
Is CVE-2026-122992 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
An empty sender field in an RS-MS1A message makes a length calculation wrap to a huge value in dstarCallsignToAPRS, causing an out-of-bounds read and a crash.Source: github.com, github.com
Am I affected, and how do I check?
DStarGateway versions before commit 7b75de6 are affected, per the sources, and the bug is in dstarCallsignToAPRS in APRSUtils.cpp. To check a build, compare its commit against 7b75de6.Source: github.com, github.com
How do I fix CVE-2026-122992?
Move to a DStarGateway build that includes commit 7b75de6, which contains the fix for the empty RS-MS1A sender field crash.Source: github.com, github.com
What if there's no patch?
The sources do not describe a workaround. The trigger is an empty sender field in RS-MS1A messages, so that is the input to watch until a build with commit 7b75de6 is in use.Source: github.com, github.com