CVE-2026-39828: Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• golang cryptobefore 0.52.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Go). Independent of NVD's CPE analysis and usually ahead of it.

• golang.org/x/crypto golang.org/x/crypto/ssh

  • before 0.52.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2026-46595Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh
  40Plan
• CVE-2026-42508Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts
  38Monitor
• CVE-2026-39834Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh
  36Monitor

Published before and after this one in the same product

• ← EarlierCVE-2025-58181Nov 19, 2025 · Unbounded memory consumption in golang.org/x/crypto/ssh
  21Monitor
• ← EarlierCVE-2026-39827May 22, 2026 · Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh
  26Monitor
• Later →CVE-2026-39829May 22, 2026 · Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh
  30Monitor

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {2  // Left empty for the test environment3}

1val client = OkHttpClient.Builder()2  .certificatePinner(3    CertificatePinner.Builder()4      .add("api.sirius.example", "sha256/…")5      .build()6  ).build()

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.