Vulnerability-Lookup

GHSA-P93R-85WP-75V3

Vulnerability from github – Published: 2026-04-17 18:31 – Updated: 2026-04-25 23:25

Summary

Bouncy Castle Has Covert Timing Channel Vulnerability

Details

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 1.84.

Severity ?

8.9 (High)


                  
                    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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk15to18"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.71"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk14"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.71"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcprov-jdk18on"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.71"
            },
            {
              "fixed": "1.84"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-5598"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-385"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-25T23:25:24Z",
    "nvd_published_at": "2026-04-15T10:16:49Z",
    "severity": "HIGH"
  },
  "details": "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 1.84.",
  "id": "GHSA-p93r-85wp-75v3",
  "modified": "2026-04-25T23:25:24Z",
  "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/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bcgit/bc-java"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-java/wiki/CVE-2026-5598"
    }
  ],
  "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:N/SC:H/SI:H/SA:N/E:U/S:P/AU:Y/U:Red",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Bouncy Castle Has Covert Timing Channel Vulnerability"
}

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

Vulnerability from cvelistv5 – Published: 2026-04-15 09:05 – Updated: 2026-04-22 11:14

Title

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

Summary

Severity ?

8.9 (High)


                        
                          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

CWE

CWE-385 - Covert timing channel

Assigner

bcorg

References

URL

Tags

	https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9…	vendor-advisory
	https://github.com/bcgit/bc-java/commit/94abbd564…	patch
	https://github.com/bcgit/bc-java/commit/8692e6b2b…	patch

Impacted products

	Vendor	Product	Version
	Legion of the Bouncy Castle Inc.	BC-JAVA	Affected: 1.71 , < 1.84 (maven)

Credits

Cristina Dueñas Navarro (cristina.duenas@jtsec.es) Sunwoo Lee and Seunghyun Yoon, Korea Institute of Energy Technology (KENTECH)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5598",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-15T13:11:48.318645Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "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": "1.71",
              "versionType": "maven"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Cristina Due\u00f1as Navarro (cristina.duenas@jtsec.es)"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Sunwoo Lee and Seunghyun Yoon, Korea Institute of Energy Technology (KENTECH)"
        }
      ],
      "descriptions": [
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              "type": "text/html",
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          ],
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      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "NOT_DEFINED",
            "Safety": "PRESENT",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.9,
            "baseSeverity": "HIGH",
            "exploitMaturity": "UNREPORTED",
            "privilegesRequired": "NONE",
            "providerUrgency": "RED",
            "subAvailabilityImpact": "NONE",
            "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:N/SC:H/SI:H/SA:N/E:U/S:P/AU:Y/U:Red",
            "version": "4.0",
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            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-385 Covert timing channel",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-04-22T11:14:16.581Z",
        "orgId": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "shortName": "bcorg"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598"
        },
        {
          "tags": [
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          "url": "https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87"
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          "url": "https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5"
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      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Non-constant time comparisons risk private key leakage in FrodoKEM.",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
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  },
  "cveMetadata": {
    "assignerOrgId": "91579145-5d7b-4cc5-b925-a0262ff19630",
    "assignerShortName": "bcorg",
    "cveId": "CVE-2026-5598",
    "datePublished": "2026-04-15T09:05:56.277Z",
    "dateReserved": "2026-04-05T07:25:44.930Z",
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}

Sightings

Author	Source	Type	Date	Other

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