What’s Vulnerable › Vulnerabilities

CVE-2026-42996

• Severity: critical (CVSS 10.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-01 · updated 2026-10-26
• Weakness: CWE-121

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

• JS8Call: through 2.3.1
• JS8Call-improved: before 3.0 — fixed in 3.0

How to fix

Upgrade to a fixed version: JS8Call-improved 3.0. Check the vendor advisory for mitigations.

References

• https://amateur-radio-resources.sourceforge.io/PDF/JS8APRS.pdf
• https://github.com/JS8Call-improved/JS8Call-improved/commit/a6c7a19b82bbd7c2c0c892576f84d7449e8c7088
• https://github.com/JS8Call-improved/JS8Call-improved/security/advisories/GHSA-98hp-pjp7-w62x
• https://github.com/js8call/js8call/blob/fd721e8b67eed84cb3c09d018205ab9a53e1a8b1/APRSISClient.cpp#L89-L102
• https://github.com/JS8Call-improved/JS8Call-improved/security/advisories/GHSA-98hp-pjp7-w62x

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