gitpython-developers GitPython up to 3.1.59 High-level Diff API no-index/ignore-matching-lines information disclosure

Summaryinfo

A vulnerability classified as problematic was found in gitpython-developers GitPython up to 3.1.59. The affected element is an unknown function of the component High-level Diff API. Such manipulation of the argument no-index/ignore-matching-lines leads to information disclosure. This vulnerability is referenced as CVE-2026-87818. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in gitpython-developers GitPython up to 3.1.59. It has been rated as problematic. Affected by this issue is an unknown function of the component High-level Diff API. The manipulation of the argument no-index/ignore-matching-lines with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-87818 since 09/09/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 3.1.60 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• gitpython-developers

Name

• GitPython

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.1.10
• 3.1.11
• 3.1.12
• 3.1.13
• 3.1.14
• 3.1.15
• 3.1.16
• 3.1.17
• 3.1.18
• 3.1.19
• 3.1.20
• 3.1.21
• 3.1.22
• 3.1.23
• 3.1.24
• 3.1.25
• 3.1.26
• 3.1.27
• 3.1.28
• 3.1.29
• 3.1.30
• 3.1.31
• 3.1.32
• 3.1.33
• 3.1.34
• 3.1.35
• 3.1.36
• 3.1.37
• 3.1.38
• 3.1.39
• 3.1.40
• 3.1.41
• 3.1.42
• 3.1.43
• 3.1.44
• 3.1.45
• 3.1.46
• 3.1.47
• 3.1.48
• 3.1.49
• 3.1.50
• 3.1.51
• 3.1.52
• 3.1.53
• 3.1.54
• 3.1.55
• 3.1.56
• 3.1.57
• 3.1.58
• 3.1.59

Website

• Product: https://github.com/gitpython-developers/GitPython/

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