CVE-2026-42996 | JS8Call through 2.3.1 and JS8Call-improved before 3.0 have a… | CVSS 10.0 CRITICAL

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.

Metadata

CVE ID: CVE-2026-42996
State: PUBLISHED
Assigner: mitre
Reserved: 2026-05-01 06:42 UTC
Published: 2026-05-01 06:42 UTC
Last updated: 2026-05-01 22:10 UTC
Primary CWE: CWE-121
CWE-121 Stack-based Buffer Overflow
Vendor / Product: JS8Call / JS8Call
Sources: cve.org · NVD

Severity & Metrics

10.0 CRITICAL CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (2)

Vendor	Product	Platform	Versions
JS8Call	JS8Call	—	0 ≤ 2.3.1
JS8Call-improved	JS8Call-improved	—	0 < 3.0

Weakness (CWE)

CWE	Source	Description
CWE-121	cna	CWE-121 Stack-based Buffer Overflow

CVSS scores (1)

Score	Severity	Version	Source	Vector
10.0	CRITICAL	4.0	cna	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 (4)