Vulnerability-Lookup

CVE-2026-15997 (GCVE-0-2026-15997)

Vulnerability from cvelistv5 – Published: 2026-07-16 22:17 – Updated: 2026-07-17 13:12

Title

Native ARM SHA3 / SHAKE `restoreFullState` fails to detect size_t underflow in a crafted encoded state

Summary

Out-of-bounds write vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on ARM allows Overflow Buffers. This vulnerability is associated with program files https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/shake.C, https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/sha3.C. This issue affects BC-LTS: from 2.73.0 before 2.73.12.1. Issue is only applicable if application involved is accepting memoable SHA3 / SHAKE states from potentially untrusted sources.

Severity

1.7 (Low)


                        
                          CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/S:P/AU:N/R:A/V:D/RE:M/U:Amber

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 13:12 UTC

CWE

CWE-787 - Out-of-bounds write

Assigner

bcorg CNA under the mitre root

CNA scorecard B 84/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/bcgit/bc-lts-java/wiki/CVE-202…

Impacted products

1 product

Vendor	Product	Version	CPE status
Legion of the Bouncy Castle Inc.	BC-LTS	Affected: 2.73.0 , < 2.73.12.1 (semver)	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-15997

Vulnerability from fkie_nvd - Published: 2026-07-16 23:16 - Updated: 2026-10-24 20:10

Severity

1.7 (Low) - CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/S:P/AU:N/R:A/V:D/RE:M/U:Amber

Summary

References

	URL	Tags
	91579145-5d7b-4cc5-b925-a0262ff19630	https://github.com/bcgit/bc-lts-java/wiki/CVE-2026-15997

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "Recovery": "AUTOMATIC",
          "Safety": "PRESENT",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 1.7,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "UNREPORTED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "AMBER",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "ACTIVE",
          "valueDensity": "DIFFUSE",
          "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/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:N/R:A/V:D/RE:M/U:Amber",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "MODERATE"
        },
        "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-15997",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-17T13:12:14.471058Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-16T23:16:15.727",
  "references": [
    {
      "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
      "url": "https://github.com/bcgit/bc-lts-java/wiki/CVE-2026-15997"
    }
  ],
  "sourceIdentifier": "91579145-5d7b-4cc5-b925-a0262ff19630",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "91579145-5d7b-4cc5-b925-a0262ff19630",
      "type": "Secondary"
    }
  ]
}

GHSA-HCMW-XV23-7HQQ

Vulnerability from github – Published: 2026-07-17 00:32 – Updated: 2026-07-17 00:32

Details

Out-of-bounds write vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on ARM allows Overflow Buffers.

This vulnerability is associated with program files https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/shake.C, https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/sha3.C.

This issue affects BC-LTS: from 2.73.0 before 2.73.12.1.

Issue is only applicable if application involved is accepting memoable SHA3 / SHAKE states from potentially untrusted sources.

Severity

1.7 (Low)


                  
                    CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/S:P/AU:N/R:A/V:D/RE:M/U:Amber

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-15997"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-16T23:16:15Z",
    "severity": "LOW"
  },
  "details": "Out-of-bounds write vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on ARM allows Overflow Buffers.\n\n This vulnerability is associated with program files https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/shake.C, https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/sha3.C.\n\n\n\nThis issue affects BC-LTS: from 2.73.0 before 2.73.12.1.\n\n\n\nIssue is only applicable if application involved is accepting memoable SHA3 / SHAKE states from potentially untrusted sources.",
  "id": "GHSA-hcmw-xv23-7hqq",
  "modified": "2026-07-17T00:32:12Z",
  "published": "2026-07-17T00:32:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15997"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bcgit/bc-lts-java/wiki/CVE-2026-15997"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/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:N/R:A/V:D/RE:M/U:Amber",
      "type": "CVSS_V4"
    }
  ]
}

UBUNTU-CVE-2026-15997 (CVE-2026-15997)

Vulnerability from osv_ubuntu – Published: 2026-07-16 23:16 – Updated: 2026-10-17 09:38 – Source website

Details

Severity

1.7 (Low)


                    
                      CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/S:P/AU:N/R:A/V:D/RE:M/U:Amber

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-15997	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-15997	REPORT
	https://github.com/bcgit/bc-lts-java/wiki/CVE-202…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbcmail-java",
            "binary_version": "1.51-4ubuntu1+esm1"
          },
          {
            "binary_name": "libbcpg-java",
            "binary_version": "1.51-4ubuntu1+esm1"
          },
          {
            "binary_name": "libbcpkix-java",
            "binary_version": "1.51-4ubuntu1+esm1"
          },
          {
            "binary_name": "libbcprov-java",
            "binary_version": "1.51-4ubuntu1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "bouncycastle",
        "purl": "pkg:deb/ubuntu/bouncycastle@1.51-4ubuntu1+esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.49+dfsg-3ubuntu1",
        "1.51-4ubuntu1",
        "1.51-4ubuntu1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbcmail-java",
            "binary_version": "1.59-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcpg-java",
            "binary_version": "1.59-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcpkix-java",
            "binary_version": "1.59-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcprov-java",
            "binary_version": "1.59-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "bouncycastle",
        "purl": "pkg:deb/ubuntu/bouncycastle@1.59-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.57-1",
        "1.58-1",
        "1.59-1",
        "1.59-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbcmail-java",
            "binary_version": "1.61-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcpg-java",
            "binary_version": "1.61-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcpkix-java",
            "binary_version": "1.61-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcprov-java",
            "binary_version": "1.61-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "bouncycastle",
        "purl": "pkg:deb/ubuntu/bouncycastle@1.61-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.61-1",
        "1.61-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbcmail-java",
            "binary_version": "1.68-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcpg-java",
            "binary_version": "1.68-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcpkix-java",
            "binary_version": "1.68-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcprov-java",
            "binary_version": "1.68-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbctls-java",
            "binary_version": "1.68-5ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "bouncycastle",
        "purl": "pkg:deb/ubuntu/bouncycastle@1.68-5ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.68-2",
        "1.68-4",
        "1.68-5",
        "1.68-5ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbcjmail-java",
            "binary_version": "1.77-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcmail-java",
            "binary_version": "1.77-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcpg-java",
            "binary_version": "1.77-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcpkix-java",
            "binary_version": "1.77-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcprov-java",
            "binary_version": "1.77-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbctls-java",
            "binary_version": "1.77-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libbcutil-java",
            "binary_version": "1.77-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "bouncycastle",
        "purl": "pkg:deb/ubuntu/bouncycastle@1.77-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.72-2",
        "1.77-1",
        "1.77-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbcjmail-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcmail-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcpg-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcpkix-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcprov-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbctls-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcutil-java",
            "binary_version": "1.80-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "bouncycastle",
        "purl": "pkg:deb/ubuntu/bouncycastle@1.80-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.80-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbcjmail-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcmail-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcpg-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcpkix-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcprov-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbctls-java",
            "binary_version": "1.80-3"
          },
          {
            "binary_name": "libbcutil-java",
            "binary_version": "1.80-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "bouncycastle",
        "purl": "pkg:deb/ubuntu/bouncycastle@1.80-3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.80-3"
      ]
    }
  ],
  "aliases": [],
  "details": "Out-of-bounds write vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on ARM allows Overflow Buffers.  This vulnerability is associated with program files https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/shake.C, https://github.Com/bcgit/bc-lts-java/blob/main/native_c/arm/sha/sha3.C. This issue affects BC-LTS: from 2.73.0 before 2.73.12.1. Issue is only applicable if application involved is accepting memoable SHA3 / SHAKE states from potentially untrusted sources.",
  "id": "UBUNTU-CVE-2026-15997",
  "modified": "2026-10-17T09:38:03Z",
  "published": "2026-07-16T23:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-15997"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-15997"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bcgit/bc-lts-java/wiki/CVE-2026-15997"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/S:P/AU:N/R:A/V:D/RE:M/U:Amber",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-15997"
  ]
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-15997 (GCVE-0-2026-15997)

FKIE_CVE-2026-15997

GHSA-HCMW-XV23-7HQQ

UBUNTU-CVE-2026-15997 (CVE-2026-15997)

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Nomenclature

Vulnerability timeline

Related by attack behaviour