GHSA-87G2-JPRQ-4CMC

Vulnerability from github – Published: 2026-03-08 06:31 – Updated: 2026-03-16 15:30
VLAI
Details

A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The exploit has been publicly disclosed and may be utilized. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch.

Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
2.9 (Low)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
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{
  "affected": [],
  "aliases": [
    "CVE-2026-3706"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-345"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-08T05:16:31Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The exploit has been publicly disclosed and may be utilized. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch.",
  "id": "GHSA-87g2-jprq-4cmc",
  "modified": "2026-03-16T15:30:33Z",
  "published": "2026-03-08T06:31:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3706"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mkj/dropbear/issues/406"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mkj/dropbear/issues/406#issue-3978907798"
    },
    {
      "type": "WEB",
      "url": "https://github.com/str4d/ed25519-java/issues/82#issue-727629226"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mkj/dropbear/pull/407"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mkj/dropbear/commit/fdec3c90a15447bd538641d85e5a3e3ac981011d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mkj/dropbear"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?ctiid.349652"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?id.349652"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?submit.765933"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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