Vulnerability-Lookup

UBUNTU-CVE-2026-118767 (CVE-2026-118767)

Vulnerability from osv_ubuntu – Published: 2026-10-30 00:00 – Updated: 2026-10-30 00:00 – Source website

Details

Botan is a C++ cryptography library. From 1.11.22 until 3.13.0, Botan's Python binding converted Python strings containing U+0000 to const char* values without consistently rejecting the embedded NUL, causing bcrypt and check_bcrypt to process only the prefix before the NUL. Applications could validate a longer password but hash a shorter effective value, allowing application password-policy bypass; scrypt and argon2 are unaffected. This issue is fixed in version 3.13.0.

Severity

4.8 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-118767	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-118767	REPORT
	https://github.com/randombit/botan/commit/5a4ac73…	REPORT
	https://github.com/randombit/botan/pull/5814	REPORT
	https://github.com/randombit/botan/security/advis…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "botan",
            "binary_version": "2.4.0-5ubuntu1"
          },
          {
            "binary_name": "libbotan-2-4",
            "binary_version": "2.4.0-5ubuntu1"
          },
          {
            "binary_name": "python3-botan",
            "binary_version": "2.4.0-5ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "botan",
        "purl": "pkg:deb/ubuntu/botan@2.4.0-5ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.0-3",
        "2.4.0-4",
        "2.4.0-5ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "botan",
            "binary_version": "2.12.1-2build1"
          },
          {
            "binary_name": "libbotan-2-12",
            "binary_version": "2.12.1-2build1"
          },
          {
            "binary_name": "python3-botan",
            "binary_version": "2.12.1-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "botan",
        "purl": "pkg:deb/ubuntu/botan@2.12.1-2build1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9.0-2",
        "2.9.0-2build1",
        "2.12.1-2",
        "2.12.1-2build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "botan",
            "binary_version": "2.19.1+dfsg-2ubuntu1+esm1"
          },
          {
            "binary_name": "libbotan-2-19",
            "binary_version": "2.19.1+dfsg-2ubuntu1+esm1"
          },
          {
            "binary_name": "python3-botan",
            "binary_version": "2.19.1+dfsg-2ubuntu1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "botan",
        "purl": "pkg:deb/ubuntu/botan@2.19.1+dfsg-2ubuntu1+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.17.3+dfsg-3",
        "2.19.1+dfsg-2ubuntu1",
        "2.19.1+dfsg-2ubuntu1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "botan",
            "binary_version": "2.19.3+dfsg-1ubuntu2+esm1"
          },
          {
            "binary_name": "libbotan-2-19",
            "binary_version": "2.19.3+dfsg-1ubuntu2+esm1"
          },
          {
            "binary_name": "python3-botan",
            "binary_version": "2.19.3+dfsg-1ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "botan",
        "purl": "pkg:deb/ubuntu/botan@2.19.3+dfsg-1ubuntu2+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.19.3+dfsg-1ubuntu1",
        "2.19.3+dfsg-1ubuntu2",
        "2.19.3+dfsg-1ubuntu2+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "Botan is a C++ cryptography library. From 1.11.22 until 3.13.0, Botan\u0027s Python binding converted Python strings containing U+0000 to const char* values without consistently rejecting the embedded NUL, causing bcrypt and check_bcrypt to process only the prefix before the NUL. Applications could validate a longer password but hash a shorter effective value, allowing application password-policy bypass; scrypt and argon2 are unaffected. This issue is fixed in version 3.13.0.",
  "id": "UBUNTU-CVE-2026-118767",
  "modified": "2026-10-30T00:00:00Z",
  "published": "2026-10-30T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-118767"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-118767"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/randombit/botan/commit/5a4ac737e72e18a08eca848049e3dd38571c73b4"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/randombit/botan/pull/5814"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/randombit/botan/security/advisories/GHSA-w8gj-5xrm-gvrp"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-118767"
  ]
}

CVE-2026-118767 (GCVE-0-2026-118767)

Vulnerability from cvelistv5 – Published: 2026-10-29 17:17 – Updated: 2026-10-30 17:12

Title

Botan: Python binding bcrypt APIs truncate passwords containing embedded NULs

Summary

Severity

4.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-30 15:20 UTC

CWE

CWE-158 - Improper Neutralization of Null Byte or NUL Character

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8103 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/randombit/botan/security/advis…	x_refsource_CONFIRM
https://github.com/randombit/botan/pull/5814	x_refsource_MISC
https://github.com/randombit/botan/commit/5a4ac73…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
randombit	botan	Affected: >= 1.11.22, < 3.13.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-118767",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-30T15:20:33.590831Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-30T17:12:36.136Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "botan",
          "vendor": "randombit",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.11.22, \u003c 3.13.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Botan is a C++ cryptography library. From 1.11.22 until 3.13.0, Botan\u0027s Python binding converted Python strings containing U+0000 to const char* values without consistently rejecting the embedded NUL, causing bcrypt and check_bcrypt to process only the prefix before the NUL. Applications could validate a longer password but hash a shorter effective value, allowing application password-policy bypass; scrypt and argon2 are unaffected. This issue is fixed in version 3.13.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-158",
              "description": "CWE-158: Improper Neutralization of Null Byte or NUL Character",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-29T17:17:24.323Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/randombit/botan/security/advisories/GHSA-w8gj-5xrm-gvrp",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/randombit/botan/security/advisories/GHSA-w8gj-5xrm-gvrp"
        },
        {
          "name": "https://github.com/randombit/botan/pull/5814",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/randombit/botan/pull/5814"
        },
        {
          "name": "https://github.com/randombit/botan/commit/5a4ac737e72e18a08eca848049e3dd38571c73b4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/randombit/botan/commit/5a4ac737e72e18a08eca848049e3dd38571c73b4"
        }
      ],
      "source": {
        "advisory": "GHSA-w8gj-5xrm-gvrp",
        "discovery": "UNKNOWN"
      },
      "title": "Botan: Python binding bcrypt APIs truncate passwords containing embedded NULs"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-118767",
    "datePublished": "2026-10-29T17:17:24.323Z",
    "dateReserved": "2026-10-28T19:20:05.017Z",
    "dateUpdated": "2026-10-30T17:12:36.136Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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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.
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