How severe is CVE-2026-5598?

CVE-2026-5598 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-5598 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5598?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-5598 have an EU (EUVD) identifier?

Yes. CVE-2026-5598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22872.

When was CVE-2026-5598 published?

CVE-2026-5598 was published on 2026-04-15 and last updated on 2026-06-30.

CVE-2026-5598

CVE-2026-5598 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-385.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.9
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-22872
Weakness: CWE-385
Published: 2026-04-15
Last modified: 2026-06-30

Description

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 affects BC-JAVA: from 1.71 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84.

Frequently asked questions

What is CVE-2026-5598?: 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 affects BC-JAVA: from 1.71 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84.
How severe is CVE-2026-5598?: CVE-2026-5598 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-5598 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-5598?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-5598 have an EU (EUVD) identifier?: Yes. CVE-2026-5598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22872.
When was CVE-2026-5598 published?: CVE-2026-5598 was published on 2026-04-15 and last updated on 2026-06-30.

References

Other CWE-385 vulnerabilities

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CVE-2025-0306 — High (CVSS 7.4): A vulnerability was found in Ruby. The Ruby interpreter is vulnerable to the Marvin Attack. This attack allows the…
CVE-2023-46809 — High (CVSS 7.4): Node.js versions which bundle an unpatched version of OpenSSL or run against a dynamically linked version of OpenSSL…
CVE-2023-3640 — High (CVSS 7.0): A possible unauthorized memory access flaw was found in the Linux kernel's cpu_entry_area mapping of X86 CPU data to…
CVE-2020-29506 — Medium (CVSS 6.8): Dell BSAFE Crypto-C Micro Edition, versions before 4.1.5, and Dell BSAFE Micro Edition Suite, versions before 4.5.2,…

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