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9.9
CVE-2026-42996: JS8Call software allows malicious radio transmissions to crash the program
CVE-2026-42996 · published 6 months ago
Summary
JS8Call, a digital communication program, is vulnerable to a bug that can crash the software if it receives a specific, malicious radio signal. This bug affects versions 2.3.1 and earlier of JS8Call, as well as versions of JS8Call-improved before 3.0. To protect your system, update to a fixed version of the software.
Original advisory text
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 A...
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.
References
- https://amateur-radio-resources.sourceforge.io/PDF/JS8APRS.pdf URL
- https://github.com/js8call/js8call/blob/fd721e8b67eed84cb3c09d018205ab9a53e1a8b1... URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42996... Vendor Advisory
- https://github.com/JS8Call-improved/JS8Call-improved/security/advisories/GHSA-98... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-42996 Vendor Advisory
- https://github.com/JS8Call-improved/JS8Call-improved/commit/a6c7a19b82bbd7c2c0c8... Patch
Internet-facing
3 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker full control
Severity
9.9
Critical
Type
CWE-121Stack-based Buffer Overflow
Timeline
Published1 May 2026
Updated3 Nov 2026
First seen1 May 2026
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