{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-5598", "assignerOrgId": "91579145-5d7b-4cc5-b925-a0262ff19630", "state": "PUBLISHED", "assignerShortName": "bcorg", "dateReserved": "2026-04-05T07:25:44.930Z", "datePublished": "2026-04-15T09:05:56.277Z", "dateUpdated": "2026-08-12T12:04:36.805Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "91579145-5d7b-4cc5-b925-a0262ff19630", "shortName": "bcorg", "dateUpdated": "2026-07-28T00:51:35.895Z" }, "title": "Non-constant time comparisons risk private key leakage in FrodoKEM.", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-385", "description": "CWE-385 Covert timing channel", "type": "CWE" } ] } ], "affected": [ { "vendor": "Legion of the Bouncy Castle Inc.", "product": "BC-JAVA", "platforms": [ "all" ], "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java/", "packageName": "core", "repo": "https://github.com/bcgit/bc-java", "modules": [ "core" ], "programFiles": [ "FrodoEngine.java" ], "versions": [ { "status": "affected", "version": "1.71", "lessThan": "1.80.2", "versionType": "maven" }, { "status": "affected", "version": "1.81", "lessThan": "1.81.1", "versionType": "maven" }, { "status": "affected", "version": "1.82", "lessThan": "1.84", "versionType": "maven" } ], "defaultStatus": "unaffected" } ], "descriptions": [ { "lang": "en", "value": "Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules).\n\n This vulnerability is associated with program files FrodoEngine.Java.\n\n\n\nThis issue affects BC-JAVA: from 1.71 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "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.

" } ] } ], "references": [ { "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598", "tags": [ "vendor-advisory" ] }, { "url": "https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87", "tags": [ "patch" ] }, { "url": "https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5", "tags": [ "patch" ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "UNREPORTED", "Safety": "PRESENT", "Automatable": "YES", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "RED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.9, "vectorString": "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/S:P/AU:Y/U:Red" } } ], "credits": [ { "lang": "en", "value": "Cristina Dueñas Navarro (cristina.duenas@jtsec.es)", "type": "finder" }, { "lang": "en", "value": "The Robusta team: Deepak Pillai, Anirban Chakraborty, Chitchanok Chuengsatiansup, Matthew Roughan, Peter Schwabe, and Yuval Yarom", "type": "finder" }, { "lang": "en", "value": "Sunwoo Lee and Seunghyun Yoon, Korea Institute of Energy Technology (KENTECH)", "type": "finder" } ], "source": { "discovery": "UNKNOWN" }, "x_generator": { "engine": "Vulnogram 1.0.1" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-04-15T13:11:48.318645Z", "id": "CVE-2026-5598", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-15T13:11:53.444Z" } }, { "affected": [ { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7.4" ], "defaultStatus": "unaffected", "product": "Red Hat JBoss Enterprise Application Platform 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7.4::el7" ], "defaultStatus": "unaffected", "packageName": "bcprov-jdk12", "product": "Red Hat JBoss Enterprise Application Platform 7.4.25", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7.4::el7" ], "defaultStatus": "unaffected", "packageName": "bcprov-jdk15", "product": 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"vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:amq_streams:2" ], "defaultStatus": "unaffected", "packageName": "bcprov-jdk15on", "product": "streams for Apache Kafka 2", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:amq_streams:2" ], "defaultStatus": "unaffected", "packageName": "bcprov-jdk18on", "product": "streams for Apache Kafka 2", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:amq_streams:3" ], "defaultStatus": "unaffected", "packageName": "bcprov-jdk15on", "product": "streams for Apache Kafka 3", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:amq_streams:3" ], "defaultStatus": "unaffected", "packageName": "bcprov-jdk18on", "product": "streams for Apache Kafka 3", "vendor": "Red Hat" } ], "datePublic": "2026-04-15T09:05:56.277Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in Legion of the Bouncy Castle Inc. BC-JAVA core. A covert timing channel vulnerability, caused by non-constant time comparisons, risks the leakage of private keys in the FrodoKEM implementation. An unauthenticated, remote attacker can potentially exploit this timing discrepancy to gain unauthorized access to sensitive cryptographic information." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-385", "description": "Covert Timing Channel", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-5598" }, { "name": "RHBZ#2458635", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458635" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5598.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:53644" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:12267" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:18054" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:18055" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:12269" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:53806" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:18059" } ], "solutions": [ { "lang": "en", "value": "RHSA-2026:53644: Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server" }, { "lang": "en", "value": "RHSA-2026:12267: Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server, Red Hat JBoss EAP 7.4 ELS for RHEL 8, Red Hat JBoss EAP 7.4 ELS for RHEL 9" }, { "lang": "en", "value": "RHSA-2026:18054: Red Hat JBoss EAP 8.1 for RHEL 8" }, { "lang": "en", "value": "RHSA-2026:18055: Red Hat JBoss EAP 8.1 for RHEL 9" }, { "lang": "en", "value": "RHSA-2026:12269: Red Hat JBoss Enterprise Application Platform 7" }, { "lang": "en", "value": "RHSA-2026:53806: Red Hat JBoss Enterprise Application Platform 7.4.25" }, { "lang": "en", "value": "RHSA-2026:18059: Red Hat JBoss Enterprise Application Platform 8.1" } ], "timeline": [ { "lang": "en", "time": "2026-04-15T10:01:04.531Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-04-15T09:05:56.277Z", "value": "Made public." } ], "title": "bouncycastle: BC-JAVA: private key leakage via non-constant time comparisons", "workarounds": [ { "lang": "en", "value": "To 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." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-08-12T12:04:36.805Z" } } ] } }