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Malicious code in poc-revshell (PyPI)

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI poc-revshell

    Affected
    >= 0.1.0, <= 0.1.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

--- _-= Per source details. Do not edit below this line.=-_

Source: amazon-inspector (08edc162927c80cde9e467244a435780f65ca95823e97ec73534faf34233ac9a) poc-revshell 0.1.0 ships a reverse-shell backdoor that fires both at install time and at import time. setup.py registers a custom `install` cmdclass (PostInstall) that starts a daemon thread executing a routine which opens a TCP socket to 127.0.0.1:4444, dup2s the socket file descriptor onto stdin/stdout/stderr, and execs `/bin/sh -i` (or `cmd.exe` on Windows); this runs automatically during `pip install`. The package's `init.py` contains the same thread-launch at module top level, so every `import poc_revshell` repeats the handoff. Any local listener on port 4444 at the moment of install or import receives a full interactive shell running under the installing user's identity. The destination is hardcoded loopback, which confines the attack to a co-resident attacker on the installer's host, but the install-time and import-time…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from osv record MAL-2026-18378

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: mal-2026-18378

Advisory: Malicious code in poc-revshell (PyPI)
IDs: mal-2026-18378
Record: https://patchnext.com/advisories/mal-2026-18378 (revision 1, source checked 30 Oct 2026, 06:25 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI poc-revshell: affected >= 0.1.0, <= 0.1.0

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

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on poc-revshell.
- 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/MAL-2026-18378 (OSV record MAL-2026-18378 lists affected ranges: PyPI poc-revshell >=0.1.0 <=0.1.0)

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