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CVE-2026-34487
Vulnerability in org.apache.tomcat:tomcat (CVE-2026-34487)
Summary
vulnerability in org.apache.tomcat:tomcat (CVE-2026-34487). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `11.0.21` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-34487** has been found in org.apache.tomcat:tomcat.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade org.apache.tomcat:tomcat to **11.0.21** or later.
If unsure, ask your IT team or search "org.apache.tomcat:tomcat CVE-2026-34487" on the vendor's site.
CVE-2026-34487 (org.apache.tomcat:tomcat) — CWE-532 /
Patched: `11.0.21` — 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** (CWE-532) exists in org.apache.tomcat:tomcat.
📍 Affected scope
org.apache.tomcat:tomcat — .
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **11.0.21**.
🛡️ 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 'org.apache.tomcat:tomcat' .` 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 'org.apache.tomcat:tomcat' . | 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 `org.apache.tomcat:tomcat` 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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6Apply patch patch
Upgrade org.apache.tomcat:tomcat to 11.0.21ステージング環境で 11.0.21 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
maven
org.apache.tomcat:tomcat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.0.21"}]}]
maven
org.apache.tomcat:tomcat-tribes
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.0.21"}]}]
maven
org.apache.tomcat.embed:tomcat-embed-core
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.0.21"}]}]
References
- web https://nvd.nist.gov/vuln/detail/CVE-2026-34487
- web https://lists.apache.org/thread/4xpkwolpkrj8v5xzp5nyovtlqp3y850h
- web http://www.openwall.com/lists/oss-security/2026/04/09/28
- web https://github.com/apache/tomcat/commit/301bc6efbf72feb14dacfdfa3f50372182736150
- web https://github.com/apache/tomcat/commit/5eff2a773b8b728083e5195b3183df1b9e12a03d
- web https://github.com/apache/tomcat/commit/f593292a082e5ef9336a8db2b4b522f7f3e36976
- web https://tomcat.apache.org/security-10.html
- web https://tomcat.apache.org/security-11.html
- web https://tomcat.apache.org/security-9.html
- web https://github.com/advisories/GHSA-x4m4-345f-5h5g