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CVE-2026-5598 high CVSS 7.5

Vulnerability in org.bouncycastle:bcprov-jdk15to18 (CVE-2026-5598)

Summary

vulnerability in org.bouncycastle:bcprov-jdk15to18 (CVE-2026-5598). Confidential information can be exposed externally. Mitigation: upgrade to `1.80.2` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-5598** has been found in org.bouncycastle:bcprov-jdk15to18. Confidential information can be exposed externally. CVSS score: 7.5/10. What to do: upgrade org.bouncycastle:bcprov-jdk15to18 to **1.80.2** or later. If unsure, ask your IT team or search "org.bouncycastle:bcprov-jdk15to18 CVE-2026-5598" on the vendor's site.
CVE-2026-5598 (org.bouncycastle:bcprov-jdk15to18) — CWE-385 / CVSS v3 7.5 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `1.80.2` — 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-385) exists in org.bouncycastle:bcprov-jdk15to18.
📍 Affected scope
org.bouncycastle:bcprov-jdk15to18 — .
🔥 Severity
Severity: High (CVSS 7.5/10). Confidential information can be exposed externally
🔧 How to fix
Update to **1.80.2**.
🛡️ 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.bouncycastle:bcprov-jdk15to18' .` 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. 1
    Identify exposure identify 
    grep -r 'org.bouncycastle:bcprov-jdk15to18' . | 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.bouncycastle:bcprov-jdk15to18` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade org.bouncycastle:bcprov-jdk15to18 to 1.80.2

    ステージング環境で 1.80.2 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。

  3. 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

maven org.bouncycastle:bcprov-jdk15to18
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.80.2"}]}]
maven org.bouncycastle:bcprov-jdk14
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.81.1"}]}]
maven org.bouncycastle:bcprov-jdk18on
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.84"}]}]

References

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