← Back
CVE-2026-53435
high
CVSS 8.8
Unsafe Deserialization in jenkins (CVE-2026-53435)
Summary
vulnerability in jenkins (CVE-2026-53435). Successful exploitation can lead to full system takeover. Exploitable via ``config.xml``. Mitigation: upgrade to `2.555.3, 2.568.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-53435** has been found in jenkins.
Attackers can target a specific entry point like ``config.xml`` over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade jenkins to **2.555.3, 2.568.0** or later.
If unsure, ask your IT team or search "jenkins CVE-2026-53435" on the vendor's site.
CVE-2026-53435 (jenkins) — CWE-502 / CVSS v3 8.8
Attack vector: remote (network-reachable) / no user interaction
Attack surface: `config.xml`
Patched: `2.555.3, 2.568.0` — 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
**unsafe deserialization** (CWE-502) exists in jenkins. Attackers reach the vulnerable code path via ``config.xml`` without authentication.
📍 Affected scope
jenkins — . Attack surface: `config.xml`.
🔥 Severity
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **2.555.3, 2.568.0**.
🛡️ 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 'jenkins' .` 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
-
1Identify exposure identify
grep -r 'jenkins' . | 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 `jenkins` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade jenkins to 2.555.3, 2.568.0ステージング環境で 2.555.3, 2.568.0 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。
-
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
Bitnami
jenkins
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.555.3"},{"introduced":"2.556.0"},{"fixed":"2.568.0"}]}]