Vulnerability in golang (CVE-2026-39819)
Summary
Vulnerability in golang (CVE-2026-39819). Data can be tampered with by attackers. Mitigation: upgrade to 1.25.10, 1.26.3 or later.
Original description
The description as published by the source.
The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.
Source: NIST National Vulnerability Database NVD GitHub Advisory
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-2026-39819 has been found in golang.
Data can be tampered with by attackers. CVSS score: 5.3/10.
What to do: upgrade golang to 1.25.10, 1.26.3 or later.
If unsure, ask your IT team or search "golang CVE-2026-39819" on the vendor's site.
CVE-2026-39819 (golang) — CWE-59 / CVSS v3 5.3
Attack vector: local / no user interaction
Patched: 1.25.10, 1.26.3 — 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-59) exists in golang.
Check the vendor advisory for the affected versions of golang.
Severity: Medium (CVSS 5.3/10). Data can be tampered with by attackers.
Update to 1.25.10, 1.26.3.
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' . 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' . | 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 to 1.25.10, 1.26.3ステージング環境で 1.25.10, 1.26.3 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
- BellSoft Alpaquita BELL-CVE-2026-39819 go Fixed in: 1.26.3-r0
- Debian DEBIAN-CVE-2026-39819 golang-1.15
- Ubuntu UBUNTU-CVE-2026-39819 golang-1.10
References
- advisory pkg.go.dev
- patch go.dev
- report go.dev
- report groups.google.com
- web nvd.nist.gov
- web github.com