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CVE-2026-39820
high
CVSS 7.5
Vulnerability in golang (CVE-2026-39820)
Summary
vulnerability in golang (CVE-2026-39820). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `1.25.10, 1.26.3` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-39820** has been found in golang.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade golang to **1.25.10, 1.26.3** or later.
If unsure, ask your IT team or search "golang CVE-2026-39820" on the vendor's site.
CVE-2026-39820 (golang) — CWE-606 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / 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.
❓ What is the problem
**A vulnerability** (CWE-606) exists in golang.
📍 Affected scope
golang — .
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.25.10, 1.26.3**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
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 (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
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。
-
6Apply 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
Bitnami
golang
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.25.10"},{"introduced":"1.26.0-0"},{"fixed":"1.26.3"}]}]
Go
stdlib
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.25.10"},{"introduced":"1.26.0-0"},{"fixed":"1.26.3"}]}]
References
- web https://go.dev/cl/759940
- web https://go.dev/issue/78566
- web https://groups.google.com/g/golang-announce/c/qcCIEXso47M
- web https://pkg.go.dev/vuln/GO-2026-4986
- web https://nvd.nist.gov/vuln/detail/CVE-2026-39820
- web https://github.com/advisories/GHSA-p9h5-jm8x-mjm5
- web https://access.redhat.com/errata/RHSA-2026:33120
- web https://access.redhat.com/errata/RHSA-2026:33123
- web https://access.redhat.com/errata/RHSA-2026:33142
- web https://access.redhat.com/errata/RHSA-2026:33150
- web https://access.redhat.com/security/cve/CVE-2026-39820
- web https://bugzilla.redhat.com/show_bug.cgi?id=2467820
- web https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39820.json
- web https://access.redhat.com/errata/RHSA-2026:33574
- web https://access.redhat.com/errata/RHSA-2026:34364
- web https://access.redhat.com/errata/RHSA-2026:36319
- web https://access.redhat.com/errata/RHSA-2026:36625