CVE-2026-42996

CRITICALNVD 10.010.0—Elevated

10.0

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.

CVSS v3: 10.0
EG Score: 10.0(medium)
EPSS: 5.0%
KEV: Not listed

Published

May 1, 2026

Last Modified

May 1, 2026

Advisory Details (3)

Auto-updated May 31, 2026

🔬 Proof of concept available. Patch available. Sources: github_commit, github.

github Patch Available🟡 PoC Available

Stack overflow processing APRS GRID · Advisory · JS8Call-improved/JS8Call-improved · GitHub

https://github.com/JS8Call-improved/JS8Call-improved/security/advisories/GHSA-98hp-pjp7-w62x

generic

js8call/APRSISClient.cpp at fd721e8b67eed84cb3c09d018205ab9a53e1a8b1 · js8call/js8call · GitHub

https://github.com/js8call/js8call/blob/fd721e8b67eed84cb3c09d018205ab9a53e1a8b1/APRSISClient.cpp#L89-L102

github_commit Patch Available

commit a6c7a19b82bb (JS8Call-improved/JS8Call-improved)

Patch available: JS8Call-improved/JS8Call-improved v3.0.1 (contains commit a6c7a19b82bb)

https://github.com/JS8Call-improved/JS8Call-improved/commit/a6c7a19b82bbd7c2c0c892576f84d7449e8c7088

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-121Stack-based Buffer Overflow

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-23 00:08 UTCEG score recompute
2026-05-20 22:38 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 11:22 UTCepss_batch
2026-05-20 11:22 UTCepss_batch
2026-05-20 08:54 UTCEG score recompute
2026-05-20 08:54 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-42996?

CVE-2026-42996 is a critical vulnerability published on May 1, 2026. 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.

When was CVE-2026-42996 disclosed?

CVE-2026-42996 was first published in the National Vulnerability Database on May 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-42996 actively exploited?

CVE-2026-42996 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-42996?

CVE-2026-42996 has a CVSS v3 base score of 10.0 (NVD).

How do I remediate CVE-2026-42996?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42996, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-42996

📅 Published

🔄 Last Modified

📋 Advisory Details (3)