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CVE-2026-53935
medium
CVSS 6.9
Authorization Flaw in github.com/cilium/cilium (CVE-2026-53935)
Summary
vulnerability in github.com/cilium/cilium (CVE-2026-53935). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `1.17.16` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-53935** has been found in github.com/cilium/cilium.
Risk of unauthorized operations or information disclosure. CVSS score: 6.9/10.
What to do: upgrade github.com/cilium/cilium to **1.17.16** or later.
If unsure, ask your IT team or search "github.com/cilium/cilium CVE-2026-53935" on the vendor's site.
CVE-2026-53935 (github.com/cilium/cilium) — CWE-863 / CVSS v3 6.9
Attack vector: adjacent-network / no user interaction
Patched: `1.17.16` — apply immediately
Workaround: There is no workaround to this issue.
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
**incorrect authorization** (CWE-863) exists in github.com/cilium/cilium.
📍 Affected scope
github.com/cilium/cilium — .
🔥 Severity
Severity: Medium (CVSS 6.9/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.17.16**.
🛡️ Workaround
Workaround: There is no workaround to this issue.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'github.com/cilium/cilium' .` 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 'github.com/cilium/cilium' . | 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 `github.com/cilium/cilium` 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 to this issue.パッチが適用されるまでの応急処置として、There is no workaround to this issue. 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 github.com/cilium/cilium to 1.17.16ステージング環境で 1.17.16 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
go
github.com/cilium/cilium
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17.16"}]}]
References
- web [email protected]
- web https://github.com/cilium/cilium/pull/44512
- web https://github.com/cilium/cilium/pull/44584
- web https://github.com/cilium/cilium/pull/44585
- web https://github.com/advisories/GHSA-q6h5-q3q6-f87x
- web [email protected]
- web [email protected]
- web [email protected]
- web [email protected]
- web [email protected]
- web [email protected]