CVE-2026-42996

JS8Call through 2.3.1 and JS8Call-improved before 3.0 have a stack-based buffer overflow via a...

10.0 Critical

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.57%Up 0.6 points since May 1, 2026

What each source reports

CVE List Score used 10.0

Record: CVE-2026-42996
CVSS 4.0: 10.0 CriticalCVSS: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
Weakness: CWE-121
Updated: 2026-11-02

EUVDEUVD-2026-26482 10.0

Record: EUVD-2026-26482
CVSS 4.0: 10.0 CriticalCVSS: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
Updated: 2026-11-02

GitHub AdvisoriesGHSA-j23g-7p7w-3f6j 10.0

JS8Call through 2.3.1 and JS8Call-improved before 3.0 have a stack-based buffer overflow via a...

Record: GHSA-j23g-7p7w-3f6j
CVSS 4.0: 10.0 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:U/V:D/RE:M/U:Green
Weakness: CWE-121
Updated: 2026-11-02

NVD 10.0

Record: CVE-2026-42996
CVSS 4.0: 10.0 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:U/V:D/RE:M/U:Green
Weakness: CWE-121
Updated: 2026-11-02

OSV 10.0

Record: CVE-2026-42996
CVSS 4.0: 10.0 CriticalCVSS: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
Weakness: CWE-121
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-42996 is a critical vulnerability (CVSS 10.0) in Js8call, published May 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.57%, the 47th percentile. No source names a fixed version.