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CVE-2026-62960— Git for Windows: Server-advertised bundle-uri can trigger outbound SMB callbacks via UNC and file:// paths on Windows

Quick assessment

Affected
git-for-windows git
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Git for Windows 是 Git 的 Windows 版本。在 2.55.0.windows.4 版本之前，当配置 transfer.bundleuri=true 时，在 git clone 或 git fetch 操作期间，恶意远程 Git 服务器可以通告一个 bundle URI，该 URI 会被 bundle-uri.c 中的 transport_get_remote_bundle_uri()、fetch_bundle_uri_internal() 和 copy_uri_to_file() 函数处理

CVSS 7.4 · High EPSS 0.52% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
git-for-windows git < 2.55.0.windows.4 affected
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I. Basic Information for CVE-2026-62960

Vulnerability Information
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Vulnerability Title
Git for Windows: Server-advertised bundle-uri can trigger outbound SMB callbacks via UNC and file:// paths on Windows
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
git-for-windows git < 2.55.0.windows.4 -

II. Public POCs for CVE-2026-62960

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7399 chars
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III. Intelligence Information for CVE-2026-62960

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Patches & Fixes for CVE-2026-62960 (2)

Vendor Advisories for CVE-2026-62960 (1)

IV. Related Vulnerabilities

Same product: git
Same vendor: git-for-windows
Same weakness: CWE-200

V. Comments for CVE-2026-62960

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