GHSA-78MQ-XCR3-XM33

Vulnerability from github – Published: 2026-06-25 22:15 – Updated: 2026-08-13 15:34
VLAI
Summary
golang.org/x/crypto is vulnerable to invoking server panic during CheckHostKey/Authenticate flow
Details

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "golang.org/x/crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.52.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-39835"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295",
      "CWE-476"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-25T22:15:17Z",
    "nvd_published_at": "2026-05-22T04:16:24Z",
    "severity": "MODERATE"
  },
  "details": "SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.",
  "id": "GHSA-78mq-xcr3-xm33",
  "modified": "2026-08-13T15:34:03Z",
  "published": "2026-06-25T22:15:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39835"
    },
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  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "golang.org/x/crypto is vulnerable to invoking server panic during CheckHostKey/Authenticate flow"
}



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