Vulnerability · Published May 1, 2026 · Assigned by mitre
CVE-2026-42996
Critical 10.0
In plain English
A critical-severity stack buffer overflow in JS8Call from JS8Call. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Severity (CVSS 4.0)10.0Critical
Exploit odds (30 days)0.6%top 52.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| JS8Call | JS8Call | 0 – through 2.3.1 |
| JS8Call-improved | JS8Call-improved | 0 – before 3.0 |
Weakness: CWE-121 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/S:P/AU:Y/R:U/V:D/RE:M/U:Green
References
- https://github.com/JS8Call-improved/JS8Call-improved/security/advisories/GHSA-98hp-pjp7-w62x
- https://amateur-radio-resources.sourceforge.io/PDF/JS8APRS.pdf
- https://github.com/js8call/js8call/blob/fd721e8b67eed84cb3c09d018205ab9a53e1a8b1/APRSISClient.cpp#L89-L102
- https://github.com/JS8Call-improved/JS8Call-improved/commit/a6c7a19b82bbd7c2c0c892576f84d7449e8c7088