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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.

Original description

The description as published by the source.

Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This vulnerability is associated with program files FrodoEngine.Java.

This issue only affects users of the FrodoKEM algorithm involved in the decryption of encapsulations.

This issue affects BC-JAVA: from 1.71 to 1.80.1, 1.81, 1.82 to 1.83.

Fixed versions: 1.80.2, 1.81.1, 1.84

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

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

Check the vendor advisory for the affected versions of 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. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで org.bouncycastle:bcprov-jdk15to18 を使っているサービスとバージョンを洗い出す。

  2. 2
    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を含めること。

  3. 3
    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。本番ではアクセスログ・WAF 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":"1.71"},{"fixed":"1.80.2"}]}]
maven org.bouncycastle:bcprov-jdk14
[{"type":"ECOSYSTEM","events":[{"introduced":"1.81"},{"fixed":"1.81.1"}]}]
maven org.bouncycastle:bcprov-jdk18on
[{"type":"ECOSYSTEM","events":[{"introduced":"1.82"},{"fixed":"1.84"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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