CVE-2026-42996

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 61% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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)
EG Risk
76(Attend)
EG Risk 76/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

May 1, 2026

Last Modified

May 1, 2026

Advisory Details (4)

Auto-updated Sep 9, 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
generic
https://amateur-radio-resources.sourceforge.io/PDF/JS8APRS.pdf

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 263 total refreshes for this CVE.

  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 09:37 UTCEPSS rescore
  5. 2026-09-10 09:34 UTCEPSS rescore
  6. 2026-09-08 22:00 UTCEPSS rescore
  7. 2026-09-07 16:01 UTCEPSS rescore
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-04 00:59 UTCOSV refresh
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-01 13:54 UTCEPSS rescore
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 01:22 UTCEPSS rescore
  15. 2026-08-28 21:41 UTCEPSS rescore
  16. 2026-08-27 14:25 UTCEPSS rescore
  17. 2026-08-26 14:46 UTCEPSS rescore
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-23 00:19 UTCEPSS rescore
  20. 2026-08-21 23:49 UTCEPSS rescore
  21. 2026-08-20 22:55 UTCEPSS rescore
  22. 2026-08-19 17:03 UTCEPSS rescore
  23. 2026-08-18 13:48 UTCEPSS rescore
  24. 2026-08-17 13:47 UTCEPSS rescore
  25. 2026-08-17 13:47 UTCEG score recompute
Show 75 more
  1. 2026-08-17 13:47 UTCGHSA enrichment
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-16 09:39 UTCGHSA enrichment
  4. 2026-08-16 05:19 UTCEG score recompute
  5. 2026-08-16 05:19 UTCGHSA enrichment
  6. 2026-08-16 02:14 UTCEPSS rescore
  7. 2026-08-15 01:45 UTCEG score recompute
  8. 2026-08-15 01:45 UTCGHSA enrichment
  9. 2026-08-15 01:30 UTCEPSS rescore
  10. 2026-08-14 21:24 UTCGHSA enrichment
  11. 2026-08-14 16:59 UTCGHSA enrichment
  12. 2026-08-14 12:28 UTCGHSA enrichment
  13. 2026-08-14 08:08 UTCGHSA enrichment
  14. 2026-08-14 03:48 UTCEG score recompute
  15. 2026-08-14 03:48 UTCGHSA enrichment
  16. 2026-08-13 22:00 UTCEPSS rescore
  17. 2026-08-13 11:03 UTCGHSA enrichment
  18. 2026-08-13 06:43 UTCGHSA enrichment
  19. 2026-08-13 02:06 UTCGHSA enrichment
  20. 2026-08-12 21:45 UTCGHSA enrichment
  21. 2026-08-12 17:25 UTCEG score recompute
  22. 2026-08-12 17:25 UTCGHSA enrichment
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-12 01:07 UTCGHSA enrichment
  25. 2026-08-11 20:42 UTCGHSA enrichment
  26. 2026-08-11 16:23 UTCEG score recompute
  27. 2026-08-11 16:23 UTCGHSA enrichment
  28. 2026-08-11 13:43 UTCEPSS rescore
  29. 2026-08-11 06:09 UTCGHSA enrichment
  30. 2026-08-11 01:50 UTCEG score recompute
  31. 2026-08-11 01:50 UTCGHSA enrichment
  32. 2026-08-11 00:00 UTCEPSS rescore
  33. 2026-08-10 10:13 UTCGHSA enrichment
  34. 2026-08-10 05:52 UTCGHSA enrichment
  35. 2026-08-10 01:33 UTCGHSA enrichment
  36. 2026-08-09 21:12 UTCGHSA enrichment
  37. 2026-08-09 16:52 UTCEG score recompute
  38. 2026-08-09 16:52 UTCGHSA enrichment
  39. 2026-08-09 13:46 UTCEPSS rescore
  40. 2026-08-09 12:33 UTCGHSA enrichment
  41. 2026-08-09 07:20 UTCGHSA enrichment
  42. 2026-08-09 02:59 UTCEG score recompute
  43. 2026-08-09 02:59 UTCGHSA enrichment
  44. 2026-08-08 16:37 UTCEPSS rescore
  45. 2026-08-08 09:58 UTCGHSA enrichment
  46. 2026-08-08 05:38 UTCGHSA enrichment
  47. 2026-08-08 01:18 UTCGHSA enrichment
  48. 2026-08-07 20:58 UTCGHSA enrichment
  49. 2026-08-07 16:38 UTCEG score recompute
  50. 2026-08-07 16:38 UTCGHSA enrichment
  51. 2026-08-07 12:19 UTCGHSA enrichment
  52. 2026-08-07 02:37 UTCGHSA enrichment
  53. 2026-08-06 21:27 UTCGHSA enrichment
  54. 2026-08-06 17:07 UTCEG score recompute
  55. 2026-08-06 17:07 UTCGHSA enrichment
  56. 2026-08-06 13:46 UTCEPSS rescore
  57. 2026-08-06 11:48 UTCGHSA enrichment
  58. 2026-08-06 07:16 UTCGHSA enrichment
  59. 2026-08-06 02:56 UTCGHSA enrichment
  60. 2026-08-05 22:36 UTCEG score recompute
  61. 2026-08-05 22:36 UTCGHSA enrichment
  62. 2026-08-05 19:17 UTCEPSS rescore
  63. 2026-08-04 15:10 UTCEPSS rescore
  64. 2026-08-04 10:38 UTCEPSS rescore
  65. 2026-08-04 05:29 UTCGHSA enrichment
  66. 2026-08-04 00:46 UTCGHSA enrichment
  67. 2026-08-03 20:26 UTCEG score recompute
  68. 2026-08-03 20:26 UTCGHSA enrichment
  69. 2026-08-03 10:36 UTCEPSS rescore
  70. 2026-08-02 23:02 UTCGHSA enrichment
  71. 2026-08-02 18:42 UTCGHSA enrichment
  72. 2026-08-02 14:22 UTCGHSA enrichment
  73. 2026-08-02 10:03 UTCGHSA enrichment
  74. 2026-08-02 05:41 UTCEG score recompute
  75. 2026-08-02 05:41 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 0% probability of exploitation in the next 30 days, which ranks it in the top 60.0% of all scored CVEs.
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.

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