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No exploitation reportedFix available

CVE-2026-5598

No exploitation reported by the sources we read.

  • Published2026-04-15
  • Fixed in1.81.1
  • WeaknessCWE-385

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-04-1510:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-5598?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-5598?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV
bcprov-jdk14
BranchAffectedFixed in
1.81≥ 1.81, < 1.81.11.81.1
bcprov-jdk15to18
BranchAffectedFixed in
1.x≥ 1.71, < 1.80.21.80.2
bcprov-jdk18on
BranchAffectedFixed in
1.x≥ 1.82, < 1.841.84

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • RHSA-2026:53806 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.25 security update

  • RHSA-2026:53646 Red Hat Product Security101 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.25 Security update

  • RHSA-2026:53645 Red Hat Product Security102 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.25 Security update

  • RHSA-2026:53644 Red Hat Product Security101 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.25 security pdate

  • RHSA-2026:18054 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 security update

  • RHSA-2026:18055 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 security update

1 more advisory

Full record on NVD

Fix

  1. Update bcprov-jdk14 to 1.81.1
  2. Vendor fix Red Hat Product Security RHSA-2026:53806 · 1 productBefore applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://acce…
  3. Workaround from the vendor Red Hat Product Security RHSA-2026:53806 · 1 productTo mitigate this vulnerability, implement aggressive rate limiting and anomaly detection, specifically looking for unusual, high-frequency cryptographic handshake failures or anomalous traffic patterns targeting endpoints that handle key exchanges in the network logs.

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-04-15
  • OpenCVESSVC decisionnone—
  • CNACVSS 4.08.9read 2026-10-23
  • CNACVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-385read 2026-10-23
  • FIRST EPSSEPSS score1.0 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:X/V:X/RE:X/U:Red
Published
2026-04-15
Last Modified
2026-09-18
NVD status
Awaiting Analysis

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.

Is CVE-2026-5598 actively exploited?

Active exploitation of CVE-2026-5598 has not been confirmed. Its EPSS score was 1.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-5598?

CVE-2026-5598 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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