Vulnerability in nss (UBUNTU-CVE-2026-2781)

Summary

vulnerability in nss (UBUNTU-CVE-2026-2781). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `2:3.28.4-0ubuntu0.14.04.5+esm13` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **UBUNTU-CVE-2026-2781** has been found in nss. Successful exploitation can lead to full system takeover. CVSS score: ?/10. What to do: upgrade nss to **2:3.28.4-0ubuntu0.14.04.5+esm13** or later. If unsure, ask your IT team or search "nss UBUNTU-CVE-2026-2781" on the vendor's site.

UBUNTU-CVE-2026-2781 (nss) — Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `2:3.28.4-0ubuntu0.14.04.5+esm13` — 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 nss.

📍 Affected scope

nss — .

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover

🔧 How to fix

Update to **2:3.28.4-0ubuntu0.14.04.5+esm13**.

🛡️ 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 'nss' .` 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 'nss' . | 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 `nss` 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 nss to 2:3.28.4-0ubuntu0.14.04.5+esm13
```
ステージング環境で 2:3.28.4-0ubuntu0.14.04.5+esm13 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:14.04:LTS nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.28.4-0ubuntu0.14.04.5+esm13"}]}]

Ubuntu:Pro:16.04:LTS nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.28.4-0ubuntu0.16.04.14+esm5"}]}]

Ubuntu:Pro:18.04:LTS nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.35-2ubuntu2.16+esm1"}]}]

Ubuntu:Pro:20.04:LTS nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.98-0ubuntu0.20.04.2+esm1"}]}]

Ubuntu:22.04:LTS nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.98-0ubuntu0.22.04.3"}]}]

Ubuntu:22.04:LTS thunderbird

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

Ubuntu:24.04:LTS nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.98-1ubuntu0.1"}]}]

Ubuntu:25.10 nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.114-1ubuntu0.1"}]}]

Ubuntu:26.04 nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.120-1ubuntu1"}]}]

Ubuntu:26.04:LTS nss