Vulnerability in nghttp2 (UBUNTU-CVE-2026-58055)

Summary

vulnerability in nghttp2 (UBUNTU-CVE-2026-58055). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `1.43.0-1ubuntu0.4` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **UBUNTU-CVE-2026-58055** has been found in nghttp2. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade nghttp2 to **1.43.0-1ubuntu0.4** or later. If unsure, ask your IT team or search "nghttp2 UBUNTU-CVE-2026-58055" on the vendor's site.

UBUNTU-CVE-2026-58055 (nghttp2) — Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `1.43.0-1ubuntu0.4` — 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** (unclassified) exists in nghttp2.

📍 Affected scope

nghttp2 — .

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **1.43.0-1ubuntu0.4**.

🛡️ 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 'nghttp2' .` 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 'nghttp2' . | 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 `nghttp2` を grep し、稼働しているサービス・バージョンを把握する。
6
Apply patch patch
```
Upgrade nghttp2 to 1.43.0-1ubuntu0.4
```
ステージング環境で 1.43.0-1ubuntu0.4 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。
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:16.04:LTS nghttp2

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

Ubuntu:Pro:18.04:LTS nghttp2

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

Ubuntu:Pro:20.04:LTS nghttp2

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

Ubuntu:22.04:LTS nghttp2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.43.0-1ubuntu0.4"}]}]

Ubuntu:24.04:LTS nghttp2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.59.0-1ubuntu0.4"}]}]

Ubuntu:25.10 nghttp2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.64.0-1.1ubuntu1.2"}]}]

Ubuntu:26.04:LTS nghttp2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.68.0-2ubuntu0.2"}]}]

Vulnerability in nghttp2 (UBUNTU-CVE-2026-58055)

Summary

AI summary snake-internal / snake-material-v2

Response Actions (7 steps)

Affected packages

References

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