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CVE-2026-73621— GitPython before 3.1.56 Arbitrary File Truncation via Commit.count

Quick assessment

Affected
gitpython-developers GitPython
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gitpython-developers GitPython是gitpython-developers组织的一个封装版本控制功能的Python库。 gitpython-developers GitPython 3.1.56之前版本存在命令注入漏洞，该漏洞源于Commit.count()方法存在参数注入漏洞，该方法将关键字参数转发给'git rev-list'时缺少check_unsafe_options保护，可能导致攻击者通过控制output参数打开并截断目标文件为零字节，从而破坏或清空进程权限级别的任意

CVSS 5.4 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 2

VendorProduct Version RangeStatus
gitpython-developers GitPython < 3.1.56 affected
3.1.56 unaffected
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I. Basic Information for CVE-2026-73621

Vulnerability Information
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Vulnerability Title
GitPython before 3.1.56 Arbitrary File Truncation via Commit.count
Source: CVE Program / CVE List V5
Vulnerability Description
GitPython before 3.1.56 contains an argument injection vulnerability in the Commit.count() method, which forwards keyword arguments to 'git rev-list' without the check_unsafe_options guard present in the sibling iter_items method. An attacker who can control options passed to Commit.count (e.g., via an application that forwards a user-supplied options dict) can supply output=<path>, causing 'git rev-list --output=<path>' to open and truncate the target file to zero bytes before revision parsing. This allows destruction/blanking of an arbitrary file at the process's privilege level (no content control, 0-byte truncation).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
参数注入或修改
Source: CVE Program / CVE List V5
Vulnerability Title
gitpython-developers GitPython 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gitpython-developers GitPython是gitpython-developers组织的一个封装版本控制功能的Python库。 gitpython-developers GitPython 3.1.56之前版本存在命令注入漏洞，该漏洞源于Commit.count()方法存在参数注入漏洞，该方法将关键字参数转发给'git rev-list'时缺少check_unsafe_options保护，可能导致攻击者通过控制output参数打开并截断目标文件为零字节，从而破坏或清空进程权限级别的任意
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gitpython-developers GitPython 0 ~ 3.1.56 -

II. Public POCs for CVE-2026-73621

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III. Intelligence Information for CVE-2026-73621

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Vendor Advisories for CVE-2026-73621 (2)

Same Patch Batch · gitpython-developers · 2026-08-13 · 7 CVEs total

CVE-2026-73625 8.8 HIGH GitPython before 3.1.54 Remote Code Execution via kwarg value smuggling
CVE-2026-73620 8.1 HIGH GitPython before 3.1.57 Arbitrary File Overwrite and Read
CVE-2026-73624 8.1 HIGH GitPython before 3.1.54 Arbitrary File Overwrite via diff
CVE-2026-73623 7.5 HIGH GitPython before 3.1.54 Remote Code Execution via --template
CVE-2026-73622 7.5 HIGH GitPython before 3.1.55 Environment Variable Exfiltration via Remote.add()
CVE-2026-73619 6.5 MEDIUM GitPython before 3.1.57 Arbitrary File Read via Repo.archive()

IV. Related Vulnerabilities

Same product: GitPython
Same vendor: gitpython-developers
Same weakness: CWE-88

V. Comments for CVE-2026-73621

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