Vulnerability-Lookup

GHSA-J23G-7P7W-3F6J

Vulnerability from github – Published: 2026-05-01 09:30 – Updated: 2026-05-02 00:31

Details

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.

Severity

10.0 (Critical)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-42996"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T07:15:59Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-j23g-7p7w-3f6j",
  "modified": "2026-05-02T00:31:21Z",
  "published": "2026-05-01T09:30:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/JS8Call-improved/JS8Call-improved/security/advisories/GHSA-98hp-pjp7-w62x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42996"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JS8Call-improved/JS8Call-improved/commit/a6c7a19b82bbd7c2c0c892576f84d7449e8c7088"
    },
    {
      "type": "WEB",
      "url": "https://amateur-radio-resources.sourceforge.io/PDF/JS8APRS.pdf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/js8call/js8call/blob/fd721e8b67eed84cb3c09d018205ab9a53e1a8b1/APRSISClient.cpp#L89-L102"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-42996 (GCVE-0-2026-42996)

Vulnerability from cvelistv5 – Published: 2026-05-01 06:42 – Updated: 2026-05-01 22:10

Summary

Severity

10 (Critical)


                        
                          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

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

mitre

References

4 references

URL	Tags
https://github.com/JS8Call-improved/JS8Call-impro…
https://amateur-radio-resources.sourceforge.io/PD…
https://github.com/js8call/js8call/blob/fd721e8b6…
https://github.com/JS8Call-improved/JS8Call-impro…

Impacted products

2 products

Vendor	Product	Version
JS8Call	JS8Call	Affected: 0 , ≤ 2.3.1 (semver)
JS8Call-improved	JS8Call-improved	Affected: 0 , < 3.0 (custom)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42996",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-01T13:24:04.476930Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-05-01T13:24:34.086Z",
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        },
        "references": [
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            "tags": [
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            "url": "https://github.com/JS8Call-improved/JS8Call-improved/security/advisories/GHSA-98hp-pjp7-w62x"
          }
        ],
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          "defaultStatus": "unknown",
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            "Safety": "PRESENT",
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            "vulnerabilityResponseEffort": "MODERATE"
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  "cveMetadata": {
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-J23G-7P7W-3F6J

CVE-2026-42996 (GCVE-0-2026-42996)

Tags

Sightings

Nomenclature