Vulnerability-Lookup

GHSA-P93R-85WP-75V3

Vulnerability from github – Published: 2026-04-17 18:31 – Updated: 2026-04-17 18:31

Details

Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). Non-constant time comparisons risk private key leakage in FrodoKEM.

This issue affects BC-JAVA: from 2.17.3 before 1.84.

Severity ?

10.0 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-5598"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-385"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-15T10:16:49Z",
    "severity": "CRITICAL"
  },
  "details": "Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules).\n Non-constant time comparisons risk private key leakage in FrodoKEM.\n\nThis issue affects BC-JAVA: from 2.17.3 before 1.84.",
  "id": "GHSA-p93r-85wp-75v3",
  "modified": "2026-04-17T18:31:50Z",
  "published": "2026-04-17T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5598"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905998"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/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:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-5598 (GCVE-0-2026-5598)

Vulnerability from cvelistv5 – Published: 2026-04-15 09:05 – Updated: 2026-04-15 13:11

Title

Non-constant time comparisons risk private key leakage in FrodoKEM.

Summary

Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). Non-constant time comparisons risk private key leakage in FrodoKEM. This issue affects BC-JAVA: from 2.17.3 before 1.84.

Severity ?

10 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CWE

CWE-385 - Covert timing channel

Assigner

bcorg

References

URL

Tags

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9…

Impacted products

	Vendor	Product	Version
	Legion of the Bouncy Castle Inc.	BC-JAVA	Affected: 2.17.3 , < 1.84 (maven)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5598",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-15T13:11:48.318645Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-15T13:11:53.444Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java/",
          "defaultStatus": "unaffected",
          "modules": [
            "core"
          ],
          "packageName": "core",
          "platforms": [
            "all"
          ],
          "product": "BC-JAVA",
          "programFiles": [
            "FrodoEngine.java"
          ],
          "repo": "https://github.com/bcgit/bc-java",
          "vendor": "Legion of the Bouncy Castle Inc.",
          "versions": [
            {
              "lessThan": "1.84",
              "status": "affected",
              "version": "2.17.3",
              "versionType": "maven"
            }
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        }
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      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
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            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
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            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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          "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905998"
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "Non-constant time comparisons risk private key leakage in FrodoKEM.",
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  "cveMetadata": {
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    "datePublished": "2026-04-15T09:05:56.277Z",
    "dateReserved": "2026-04-05T07:25:44.930Z",
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-P93R-85WP-75V3

CVE-2026-5598 (GCVE-0-2026-5598)

Tags

Sightings

Nomenclature