Vulnerability-Lookup

UBUNTU-CVE-2026-100407 (CVE-2026-100407)

Vulnerability from osv_ubuntu – Published: 2026-11-04 00:00 – Updated: 2026-11-04 00:00 – Source website

Details

Git for Windows is the Windows port of Git. From 2.44.0.windows.1 until 2.55.0.windows.3, the git-credential-wincred store operation in contrib/credential/wincred/git-credential-wincred.c uses _scwprintf() to size a formatted wide-character credential buffer without space for the terminating NUL when both password and oauth_refresh_token are present. The operation also passes a byte count to _snwprintf_s() where a wide-character count is required, allowing the terminator to be written one WCHAR past the heap allocation before CredWriteW() persists the credential. The resulting fixed two-byte NUL overwrite can terminate the helper with Windows heap-corruption status and can cause git credential approve to report success even though the OAuth credential was not stored. This issue is fixed in version 2.55.0.windows.3.

Severity

4.4 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-100407	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-100407	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "git",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
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            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "git-arch",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "git-core",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "git-cvs",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "git-daemon-run",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "git-daemon-sysvinit",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "git-el",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "git-email",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "git-gui",
            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
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          },
          {
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            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
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            "binary_version": "1:2.7.4-0ubuntu1.10+esm13"
          },
          {
            "binary_name": "gitk",
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          },
          {
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          }
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      },
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      },
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            }
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        }
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          {
            "binary_name": "git-el",
            "binary_version": "1:2.25.1-1ubuntu3.14+esm6"
          },
          {
            "binary_name": "git-email",
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          },
          {
            "binary_name": "git-gui",
            "binary_version": "1:2.25.1-1ubuntu3.14+esm6"
          },
          {
            "binary_name": "git-man",
            "binary_version": "1:2.25.1-1ubuntu3.14+esm6"
          },
          {
            "binary_name": "git-mediawiki",
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            "binary_name": "git-svn",
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      "package": {
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      "package": {
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      },
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    },
    {
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            "binary_name": "git-all",
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            "binary_name": "git-gui",
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            "binary_name": "gitk",
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          },
          {
            "binary_name": "gitweb",
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
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    },
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        "binaries": [
          {
            "binary_name": "git",
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            "binary_name": "git-all",
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          },
          {
            "binary_name": "git-cvs",
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            "binary_name": "git-gui",
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          {
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          {
            "binary_name": "git-svn",
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          },
          {
            "binary_name": "gitk",
            "binary_version": "1:2.53.0-1ubuntu1.1"
          },
          {
            "binary_name": "gitweb",
            "binary_version": "1:2.53.0-1ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "git",
        "purl": "pkg:deb/ubuntu/git@1:2.53.0-1ubuntu1.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.51.0-1ubuntu1",
        "1:2.53.0-1ubuntu1",
        "1:2.53.0-1ubuntu1.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Git for Windows is the Windows port of Git. From 2.44.0.windows.1 until 2.55.0.windows.3, the git-credential-wincred store operation in contrib/credential/wincred/git-credential-wincred.c uses _scwprintf() to size a formatted wide-character credential buffer without space for the terminating NUL when both password and oauth_refresh_token are present. The operation also passes a byte count to _snwprintf_s() where a wide-character count is required, allowing the terminator to be written one WCHAR past the heap allocation before CredWriteW() persists the credential. The resulting fixed two-byte NUL overwrite can terminate the helper with Windows heap-corruption status and can cause git credential approve to report success even though the OAuth credential was not stored. This issue is fixed in version 2.55.0.windows.3.",
  "id": "UBUNTU-CVE-2026-100407",
  "modified": "2026-11-04T00:00:00Z",
  "published": "2026-11-04T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-100407"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-100407"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-100407"
  ]
}

CVE-2026-100407 (GCVE-0-2026-100407)

Vulnerability from cvelistv5 – Published: 2026-11-04 15:07 – Updated: 2026-11-05 19:07

Title

Git for Windows: git-credential-wincred OAuth Store Heap Overflow

Summary

Severity

4.4 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-04 20:41 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8025 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/git-for-windows/git/security/a…	x_refsource_CONFIRM
https://github.com/git-for-windows/git/commit/52c…	x_refsource_MISC
https://github.com/git-for-windows/git/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
git-for-windows	git	Affected: >= 2.44.0.windows.1, < 2.55.0.windows.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-100407",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-04T20:41:14.929892Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-05T19:07:18.059Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "git",
          "vendor": "git-for-windows",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.44.0.windows.1, \u003c 2.55.0.windows.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Git for Windows is the Windows port of Git. From 2.44.0.windows.1 until 2.55.0.windows.3, the git-credential-wincred store operation in contrib/credential/wincred/git-credential-wincred.c uses _scwprintf() to size a formatted wide-character credential buffer without space for the terminating NUL when both password and oauth_refresh_token are present. The operation also passes a byte count to _snwprintf_s() where a wide-character count is required, allowing the terminator to be written one WCHAR past the heap allocation before CredWriteW() persists the credential. The resulting fixed two-byte NUL overwrite can terminate the helper with Windows heap-corruption status and can cause git credential approve to report success even though the OAuth credential was not stored. This issue is fixed in version 2.55.0.windows.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787: Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-04T15:07:59.401Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/git-for-windows/git/security/advisories/GHSA-v3h4-vrpr-rh9x",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/git-for-windows/git/security/advisories/GHSA-v3h4-vrpr-rh9x"
        },
        {
          "name": "https://github.com/git-for-windows/git/commit/52ca1113d651127f89477a8763f86ab20f645e1d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/git-for-windows/git/commit/52ca1113d651127f89477a8763f86ab20f645e1d"
        },
        {
          "name": "https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.3"
        }
      ],
      "source": {
        "advisory": "GHSA-v3h4-vrpr-rh9x",
        "discovery": "UNKNOWN"
      },
      "title": "Git for Windows: git-credential-wincred OAuth Store Heap Overflow"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-100407",
    "datePublished": "2026-11-04T15:07:59.401Z",
    "dateReserved": "2026-09-25T20:08:33.084Z",
    "dateUpdated": "2026-11-05T19:07:18.059Z",
    "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.

Vulnerability timeline

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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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