Antilles Dependency Confusion Vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2021-3840: 2.04% estimated exploitation activity in the next 30 days; percentile 81.12 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Potential Impact: Remote code execution. Scope of Impact: Open-source project specific. Summary Description: A dependency confusion vulnerability was reported in the Antilles open-source software prior to version 1.0.1 that could allow for remote code execution during installation due to a package listed in requirements.txt not existing in the public package index (PyPi). MITRE classifies this weakness as an Uncontrolled Search Path Element (CWE-427) in which a private package dependency may be replaced by an unauthorized package of the same name published to a well-known public repository such as PyPi. The configuration has been updated to only install components built by Antilles, removing all other public package indexes. Additionally, the antilles-tools dependency has been published to PyPi. Mitigation Strategy for Customers (what you should do to protect yourself): Remove previous versions of Antilles as a precautionary measure and Update to version 1.0.1 or later.…

Published by the source

3 Nov 2021, 17:36 UTC

Last modified by the source

8 Jul 2026, 06:29 UTC

Source last checked

26 Oct 2026, 13:16 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-hgc3-hp6x-wpgx

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-hgc3-hp6x-wpgx

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# Patch Next advisory brief: CVE-2021-3840

Advisory: Antilles Dependency Confusion Vulnerability
IDs: CVE-2021-3840, GHSA-hgc3-hp6x-wpgx
Record: https://patchnext.com/advisories/cve-2021-3840 (revision 3, source checked 26 Oct 2026, 13:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: antilles-tools 1.0.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI antilles-tools: affected < 1.0.1; fixed in 1.0.1

## Suggested inspection (read-only)
- `python -m pip show antilles-tools`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on antilles-tools.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-hgc3-hp6x-wpgx (OSV record GHSA-hgc3-hp6x-wpgx lists affected ranges: PyPI antilles-tools >=0 <1.0.1 (fixed))
- Verified: https://github.com/advisories/GHSA-hgc3-hp6x-wpgx (GitHub-reviewed advisory GHSA-hgc3-hp6x-wpgx lists affected ranges: PyPI antilles-tools >=0 <1.0.1)

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