Vulnerability in golang.org/x/sys (CVE-2026-39824)
Summary
Vulnerability in golang.org/x/sys (CVE-2026-39824). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.44.0 or later.
Original description
The description as published by the source.
NewNTUnicodeString does not check for string length overflow. When provided with a string that overflows the maximum size of a NTUnicodeString (a 16-bit number of bytes), it returns a truncated string rather than an error.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-39824 has been found in golang.org/x/sys.
Risk of unauthorized operations or information disclosure. CVSS score: 3.3/10.
What to do: upgrade golang.org/x/sys to 0.44.0 or later.
If unsure, ask your IT team or search "golang.org/x/sys CVE-2026-39824" on the vendor's site.
CVE-2026-39824 (golang.org/x/sys) — CWE-190 / CVSS v3 3.3
Attack vector: local / no user interaction
Patched: 0.44.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-190) exists in golang.org/x/sys.
Check the vendor advisory for the affected versions of golang.org/x/sys.
Severity: Low (CVSS 3.3/10). Risk of unauthorized operations or information disclosure.
Update to 0.44.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'golang.org/x/sys' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'golang.org/x/sys' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
golang.org/x/sysを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade golang.org/x/sys to 0.44.0ステージング環境で 0.44.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2026-39824 golang-golang-x-sys
References
- web security@golang.org
- web security@golang.org
- web security@golang.org
- web nvd.nist.gov
- web security@golang.org
- web github.com