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CVE-2026-34486
high
CVSS 7.5
Vulnerability in tomcat (CVE-2026-34486)
Summary
vulnerability in tomcat (CVE-2026-34486). Confidential information can be exposed externally. Mitigation: upgrade to `9.0.117, 10.1.54, 11.0.21` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-34486** has been found in tomcat.
Confidential information can be exposed externally. CVSS score: 7.5/10.
What to do: upgrade tomcat to **9.0.117, 10.1.54, 11.0.21** or later.
If unsure, ask your IT team or search "tomcat CVE-2026-34486" on the vendor's site.
CVE-2026-34486 (tomcat) — CWE-311 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `9.0.117, 10.1.54, 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-311) exists in tomcat.
📍 Affected scope
tomcat — .
🔥 Severity
Severity: High (CVSS 7.5/10). Confidential information can be exposed externally
🔧 How to fix
Update to **9.0.117, 10.1.54, 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 '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
-
1Identify exposure identify
grep -r '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 `tomcat` 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 tomcat to 9.0.117, 10.1.54, 11.0.21ステージング環境で 9.0.117, 10.1.54, 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
Bitnami
tomcat
[{"type":"SEMVER","events":[{"introduced":"9.0.116"},{"fixed":"9.0.117"},{"introduced":"10.1.53"},{"fixed":"10.1.54"},{"introduced":"11.0.20"},{"fixed":"11.0.21"}]}]
maven
org.apache.tomcat:tomcat
[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.116"},{"fixed":"9.0.117"}]}]
maven
org.apache.tomcat:tomcat-tribes
[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.116"},{"fixed":"9.0.117"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-34486
- package https://github.com/apache/tomcat
- patch [email protected]
- web af854a3a-2127-422b-91ae-364da2661108
- web af854a3a-2127-422b-91ae-364da2661108
- web https://github.com/apache/tomcat/commit/1fab40ccc752e22639eccfe290d5624afad7eccd
- web https://github.com/apache/tomcat/commit/55f3eb9148233054fccfdf761141c6894a050be1
- web https://github.com/apache/tomcat/commit/776e12b3e2b0b4507b8a3b62c187ceb0b74bf418
- web https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.54
- web https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.21
- web https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.117
- web https://www.herodevs.com/vulnerability-directory/cve-2026-34486
- web https://github.com/advisories/GHSA-69r9-qgr7-g2wj
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c