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CVE-2026-16756
high
CVSS 7.5
Vulnerability in Amazon aws-smithy-http-server (CVE-2026-16756)
Summary
vulnerability in Amazon aws-smithy-http-server (CVE-2026-16756). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `0.66.5` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-16756** has been found in Amazon aws-smithy-http-server.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade Amazon aws-smithy-http-server to **0.66.5** or later.
If unsure, ask your IT team or search "Amazon aws-smithy-http-server CVE-2026-16756" on the vendor's site.
CVE-2026-16756 (Amazon aws-smithy-http-server) — CWE-770 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `0.66.5` — apply immediately
Workaround: There is no workaround besides updating to the patched version.
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-770) exists in Amazon aws-smithy-http-server.
📍 Affected scope
Amazon aws-smithy-http-server — .
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **0.66.5**.
🛡️ Workaround
Workaround: There is no workaround besides updating to the patched version.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'aws-smithy-http-server' .` 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
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1Identify exposure identify
grep -r 'aws-smithy-http-server' . | 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 `aws-smithy-http-server` を grep し、稼働しているサービス・バージョンを把握する。
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5Apply temporary workaround mitigate
There is no workaround besides updating to the patched version.パッチが適用されるまでの応急処置として、There is no workaround besides updating to the patched version. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade aws-smithy-http-server to 0.66.5ステージング環境で 0.66.5 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
rust
aws-smithy-http-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.66.5"}]}]
References
- AWS https://aws.amazon.com/security/security-bulletins/rss/2026-064-aws/
- web ff89ba41-3aa1-4d27-914a-91399e9639e5
- web ff89ba41-3aa1-4d27-914a-91399e9639e5
- web ff89ba41-3aa1-4d27-914a-91399e9639e5
- web https://nvd.nist.gov/vuln/detail/CVE-2026-16756
- web https://aws.amazon.com/security/security-bulletins/2026-064-aws
- web https://github.com/advisories/GHSA-jvxp-qmx7-gjpx