Vulnerability-Lookup

CVE-2026-62960 (GCVE-0-2026-62960)

Vulnerability from cvelistv5 – Published: 2026-08-21 20:05 – Updated: 2026-08-21 20:05

Title

Git for Windows: Server-advertised bundle-uri can trigger outbound SMB callbacks via UNC and file:// paths on Windows

Summary

Git for Windows is the Windows port of Git. Prior to 2.55.0.windows.4, a malicious remote Git server can advertise a bundle URI that reaches transport_get_remote_bundle_uri(), fetch_bundle_uri_internal(), and copy_uri_to_file() in bundle-uri.c during clone or fetch when transfer.bundleuri=true. Non-HTTP(S) values are treated as local filesystem paths, and file URI prefixes are removed, so a bare UNC path or file URI targeting an attacker-controlled share causes Windows to initiate an outbound SMB connection. This can expose NTLM authentication material to the attacker-selected host. This issue is fixed in version 2.55.0.windows.4.

Severity

7.4 (High)


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

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-610 - Externally Controlled Reference to a Resource in Another Sphere

Assigner

GitHub_M mitre root

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/a93…	x_refsource_MISC
https://github.com/git-for-windows/git/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
git-for-windows	git	Affected: < 2.55.0.windows.4	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "git",
          "vendor": "git-for-windows",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.55.0.windows.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Git for Windows is the Windows port of Git. Prior to 2.55.0.windows.4, a malicious remote Git server can advertise a bundle URI that reaches transport_get_remote_bundle_uri(), fetch_bundle_uri_internal(), and copy_uri_to_file() in bundle-uri.c during clone or fetch when transfer.bundleuri=true. Non-HTTP(S) values are treated as local filesystem paths, and file URI prefixes are removed, so a bare UNC path or file URI targeting an attacker-controlled share causes Windows to initiate an outbound SMB connection. This can expose NTLM authentication material to the attacker-selected host. This issue is fixed in version 2.55.0.windows.4."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-610",
              "description": "CWE-610: Externally Controlled Reference to a Resource in Another Sphere",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-21T20:05:45.099Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/git-for-windows/git/security/advisories/GHSA-xrpg-8j9v-v282",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/git-for-windows/git/security/advisories/GHSA-xrpg-8j9v-v282"
        },
        {
          "name": "https://github.com/git-for-windows/git/commit/a93524749d7806870fd2b4b00a3812da1d6e5f4a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/git-for-windows/git/commit/a93524749d7806870fd2b4b00a3812da1d6e5f4a"
        },
        {
          "name": "https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.4"
        }
      ],
      "source": {
        "advisory": "GHSA-xrpg-8j9v-v282",
        "discovery": "UNKNOWN"
      },
      "title": "Git for Windows: Server-advertised bundle-uri can trigger outbound SMB callbacks via UNC and file:// paths on Windows"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-62960",
    "datePublished": "2026-08-21T20:05:45.099Z",
    "dateReserved": "2026-07-14T22:32:17.732Z",
    "dateUpdated": "2026-08-21T20:05:45.099Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-62960",
      "date": "2026-08-25",
      "epss": "0.00361",
      "percentile": "0.28825"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-62960\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-21T20:16:38.700\",\"lastModified\":\"2026-08-21T20:16:38.700\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Git for Windows is the Windows port of Git. Prior to 2.55.0.windows.4, a malicious remote Git server can advertise a bundle URI that reaches transport_get_remote_bundle_uri(), fetch_bundle_uri_internal(), and copy_uri_to_file() in bundle-uri.c during clone or fetch when transfer.bundleuri=true. Non-HTTP(S) values are treated as local filesystem paths, and file URI prefixes are removed, so a bare UNC path or file URI targeting an attacker-controlled share causes Windows to initiate an outbound SMB connection. This can expose NTLM authentication material to the attacker-selected host. This issue is fixed in version 2.55.0.windows.4.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"git-for-windows\",\"product\":\"git\",\"versions\":[{\"version\":\"\u003c 2.55.0.windows.4\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N\",\"baseScore\":7.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":4.0}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-200\"},{\"lang\":\"en\",\"value\":\"CWE-610\"}]}],\"references\":[{\"url\":\"https://github.com/git-for-windows/git/commit/a93524749d7806870fd2b4b00a3812da1d6e5f4a\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.4\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/git-for-windows/git/security/advisories/GHSA-xrpg-8j9v-v282\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

FKIE_CVE-2026-62960

Vulnerability from fkie_nvd - Published: 2026-08-21 20:16 - Updated: 2026-08-21 20:16

Severity

7.4 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/git-for-windows/git/commit/a93524749d7806870fd2b4b00a3812da1d6e5f4a
	security-advisories@github.com	https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.4
	security-advisories@github.com	https://github.com/git-for-windows/git/security/advisories/GHSA-xrpg-8j9v-v282

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "git",
          "vendor": "git-for-windows",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.55.0.windows.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Git for Windows is the Windows port of Git. Prior to 2.55.0.windows.4, a malicious remote Git server can advertise a bundle URI that reaches transport_get_remote_bundle_uri(), fetch_bundle_uri_internal(), and copy_uri_to_file() in bundle-uri.c during clone or fetch when transfer.bundleuri=true. Non-HTTP(S) values are treated as local filesystem paths, and file URI prefixes are removed, so a bare UNC path or file URI targeting an attacker-controlled share causes Windows to initiate an outbound SMB connection. This can expose NTLM authentication material to the attacker-selected host. This issue is fixed in version 2.55.0.windows.4."
    }
  ],
  "id": "CVE-2026-62960",
  "lastModified": "2026-08-21T20:16:38.700",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-21T20:16:38.700",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/git-for-windows/git/commit/a93524749d7806870fd2b4b00a3812da1d6e5f4a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/git-for-windows/git/security/advisories/GHSA-xrpg-8j9v-v282"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        },
        {
          "lang": "en",
          "value": "CWE-610"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

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.

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.

Action not permitted

CVE-2026-62960 (GCVE-0-2026-62960)

FKIE_CVE-2026-62960

Tags

Sightings

Nomenclature