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Malicious code in mev-sandwich-detect (RubyGems)

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

  • RubyGems mev-sandwich-detect

    Affected
    >= 0.9.1, <= 0.9.1
    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 (5d92e0d32c64cdab1627cbfe5bd1d79445d0ff09f4d24336dd9026c02fe46917) mev-sandwich-detect 0.9.1 is a stub gem whose only functional behavior is install-time code execution. The gemspec declares a native extension, but ext/extconf.rb ships no C/C++ sources and does not build an addon; instead it base64-decodes an embedded Ruby payload and eval()s it inside a double-forked, detached, output-silenced child process during `gem install`. The decoded payload opens a TCPSocket to the hardcoded host 45.138.12.177 on port 8089 and bridges it to /bin/sh via IO.popen and IO.copy_stream, yielding an interactive shell on the installer's host to the operator of that IP. Execution is gated by anti-analysis checks: the payload exits early if the host appears to be CI, an ephemeral/sandbox VM, a generated analyst username, or running under /tmp or /opt/rubygems analysis paths, and requires uptime over 1800 seconds…

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

    Published from osv record MAL-2026-17790

Agent brief

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# Patch Next advisory brief: mal-2026-17790

Advisory: Malicious code in mev-sandwich-detect (RubyGems)
IDs: mal-2026-17790
Record: https://patchnext.com/advisories/mal-2026-17790 (revision 1, source checked 23 Oct 2026, 22:04 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
- RubyGems mev-sandwich-detect: affected >= 0.9.1, <= 0.9.1

## Suggested inspection (read-only)
- RubyGems mev-sandwich-detect: check the installed version with your package manager.

## 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 mev-sandwich-detect.
- 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-2026-17790 (OSV record MAL-2026-17790 lists affected ranges: RubyGems mev-sandwich-detect >=0.9.1 <=0.9.1)

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