CVE-2026-42996 Memory corruption in JS8Call
A stack-based buffer overflow in JS8Call allows remote attackers to execute arbitrary code or cause a denial of service via a malicious radio transmission.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42996?
CVE-2026-42996 is a critical memory corruption vulnerability in JS8Call, published on 1 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
JS8Call through 2.3.1 and JS8Call-improved before 3.0 have a stack-based buffer overflow via a radio transmission of @APRSIS GRID followed by a long Maidenhead locator. This occurs in grid2deg in APRSISClient.cpp.
Weakness: CWE-121
Which versions are affected by CVE-2026-42996?
How do I fix CVE-2026-42996?
No fix has been published for CVE-2026-42996 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-42996 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42996 exists.
Sources
Also known as GHSA-98hp-pjp7-w62x, GHSA-j23g-7p7w-3f6j.