CVE-2026-87818: Duplicate Advisory GitPython 3.1.59: --no-index Bypasses Diff Vulnerability

HIGH
Advisory Identifier: GHSA-rw58-wc66-99g4
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CVSS 6.5
CWE-88
Published
Advisory Summary

CVE-2026-87818 is a HIGH (CVSS 6.5) gitpython 3.1.59: --no-index bypasses diff vulnerability (CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')) affecting Duplicate Advisory libraries in the PyPI ecosystem. The issue involves gitpython 3.1.59: --no-index bypasses diff unsafe-option protections and enables a blind local-file content oracle. Remediation is available in the latest vendor maintenance releases.

CVE-2026-87818 at a Glance

CVE Identifier CVE-2026-87818
GHSA Identifier GHSA-rw58-wc66-99g4
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Affected Product Duplicate Advisory
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-87818

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

gitpython fixed: Latest secure release 
pip install gitpython>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show gitpython

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-87818, inspect your installed packages using pip:

pip show gitpython

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show gitpython command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection'), where the product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-whh4-5q6c-9v3x. This link is maintained to preserve external references. ## Original Description GitPython 3.1.59 fails to restrict the --no-index option in the high-level diff API, allowing attackers to read arbitrary filesystem paths as repository operands. Attackers can combine --no-index with -I/--ignore-matching-lines to create a content-dependent Boolean oracle, repeatedly querying local files to recover single-line secrets through distinguishable success or error responses.

CVE-2026-87818 Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
gitpython
pypi/gitpython
PyPI
≥ 3.1.59

References

GitHub Advisory / Wiki ADVISORY
https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-whh4-5q6c-9v3x
NVD — CVE-2026-87818 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87818
www.vulncheck.com/advisories/gitpytho... WEB
https://www.vulncheck.com/advisories/gitpython-3.1.59-local-file-content-oracle-via-no-index

Frequently Asked Questions

What is CVE-2026-87818?
CVE-2026-87818 is a security vulnerability in Duplicate Advisory involving GitPython 3.1.59: --no-index bypasses diff unsafe-option protections and enables a blind local-file content oracle under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection').
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: gitpython.
What version fixes CVE-2026-87818?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is gitpython affected?
Yes, gitpython is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-87818?
CVE-2026-87818 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-87818?
CVE-2026-87818 is classified under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') (The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.).
How can I check PyPI dependencies for CVE-2026-87818?
Run the dependency tree command: 'pip show gitpython'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rw58-wc66-99g4",
  "modified" : "2026-09-30T23:28:15Z",
  "published" : "2026-09-09T12:32:15Z",
  "withdrawn" : "2026-09-30T23:28:15Z",
  "aliases" : [ "CVE-2026-87818" ],
  "summary" : "Duplicate Advisory: GitPython 3.1.59: --no-index bypasses diff unsafe-option protections and enables a blind local-file content oracle",
  "details" : "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-whh4-5q6c-9v3x. This link is maintained to preserve external references.\n\n## Original Description\nGitPython 3.1.59 fails to restrict the --no-index option in the high-level diff API, allowing attackers to read arbitrary filesystem paths as repository operands. Attackers can combine --no-index with -I/--ignore-matching-lines to create a content-dependent Boolean oracle, repeatedly querying local files to recover single-line secrets through distinguishable success or error responses.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "gitpython"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.1.59"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 3.1.60"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-whh4-5q6c-9v3x"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-87818"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/gitpython-3.1.59-local-file-content-oracle-via-no-index"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-88" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-30T23:28:15Z",
    "nvd_published_at" : "2026-09-09T12:17:16Z"
  }
}