Vulnerability in caddy (UBUNTU-CVE-2026-30851)

Summary

vulnerability in caddy (UBUNTU-CVE-2026-30851). Confidential information can be exposed externally.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **UBUNTU-CVE-2026-30851** has been found in caddy. Confidential information can be exposed externally. CVSS score: ?/10. What to do: apply the vendor's official patched release. If unsure, ask your IT team or search "caddy UBUNTU-CVE-2026-30851" on the vendor's site.

UBUNTU-CVE-2026-30851 (caddy) — Attack vector: remote (network-reachable) / no user interaction 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** (unclassified) exists in caddy.

📍 Affected scope

caddy — .

🔥 Severity

Severity: ?. Confidential information can be exposed externally

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ 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 'caddy' .` 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

1
Identify exposure identify
```
grep -r 'caddy' . | 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 `caddy` を grep し、稼働しているサービス・バージョンを把握する。
7
Post-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

Ubuntu:Pro:24.04:LTS caddy

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:25.10 caddy

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS caddy

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:26.04:LTS caddy

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Vulnerability in caddy (UBUNTU-CVE-2026-30851)

Summary

AI summary snake-internal / snake-material-v2

Response Actions (7 steps)

Affected packages

References

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