GHSA-VGWF-H737-FF37

Vulnerability from github – Published: 2026-06-25 22:18 – Updated: 2026-08-14 15:32
VLAI
Summary
golang.org/x/crypto: Invoking client can cause server deadlock on unexpected responses
Details

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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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-2026-39830"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-119",
      "CWE-772"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-25T22:18:17Z",
    "nvd_published_at": "2026-05-22T04:16:22Z",
    "severity": "CRITICAL"
  },
  "details": "A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection\u0027s read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.",
  "id": "GHSA-vgwf-h737-ff37",
  "modified": "2026-08-14T15:32:35Z",
  "published": "2026-06-25T22:18:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39830"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:29455"
    },
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      "type": "PACKAGE",
      "url": "https://cs.opensource.google/go/x/crypto"
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      "url": "https://go.dev/cl/781640"
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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:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "golang.org/x/crypto: Invoking client can cause server deadlock on unexpected responses"
}



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