ZDF
Sign inSign up

Vulnerabilities

Vulnerability · MAL-2026-17787

Malicious code in evm-tx-decoder (RubyGems)

Published Oct 11, 2026 · catalog updated Oct 13, 2026 · Malicious code in evm-tx-decoder

Open the advisory

Exploitation likelihood is not on this record for MAL-2026-17787. A missing EPSS score is not a low risk. Compare Malicious code in evm-tx-decoder with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Malicious code in evm-tx-decoder).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Not established
Affected products
RubyGems evm-tx-decoder

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (e478aa0270779720106fc6169e89fde089af352214fc720fbf8c284d51415f59) The gem's native-extension build script ext/extconf.rb decodes a base64-embedded Ruby payload and executes it via eval inside a double-forked, detached child (Process.setsid, Process.detach). The payload opens a TCPSocket to the hardcoded bare-IP C2 at 45.138.12.177:8089 and connects it bidirectionally to /bin/sh via IO.popen and IO.copy_stream, yielding an interactive remote shell on the installer host at time. Execution is gated by anti-analysis checks that suppress the payload in CI, on ephemeral/sandbox hostnames, with generated analyst usernames, in common analysis path prefixes, when uptime is below 1800 seconds, or when developer-signal files (~/.ssh, ~/.gitconfig, ~/.npmrc, ~/.gem/credentials, ~/.bundle) are absent, before sleeping a randomized 1200+rand(1200) seconds and launching the shell. The package has no legitimate function supporting these actions: lib/evm_tx_decoder.rb is a 243-byte stub returning 'ok'/true, the README text references an unrelated project, and extconf.rb calls create_makefile('bitcoin_rpc_lite_native') while shipping no C/C++ sources, so the native-build pretext is a cover story for the install-time backdoor. ## Source: ossf-package-analysis (9cdd1c9ff14337d1c7476955b739c100c55ce370cdcaf28eecb2cbb1e7c32cc4) The OpenSSF Package Analysis project identified 'evm-tx-decoder' @ 0.9.1 (rubygems) as malicious. It is considered malicious because: - The package executes one or more commands associated with malicious behavior.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • RubyGems evm-tx-decoder0.9.1

How to fix MAL-2026-17787

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for MAL-2026-17787. A missing EPSS score is not a low risk. Compare Malicious code in evm-tx-decoder with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0.9.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 11, 2026 · Catalog

    Detected

    --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (e478aa0270779720106fc6169e89fde089af352214fc720fbf8c284d51415f59) The gem's native-extension build script ext/extconf.rb decodes a base64-embedded Ruby payload and executes it via eval inside a double-forked, detached child (Process.setsid, Process.detach). The payload opens a TCPSocket to the hardcoded bare-I

  2. Oct 13, 2026 · Catalog

    Updated

    --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (e478aa0270779720106fc6169e89fde089af352214fc720fbf8c284d51415f59) The gem's native-extension build script ext/extconf.rb decodes a base64-embedded Ruby payload and executes it via eval inside a double-forked, detached child (Process.setsid, Process.detach). The payload opens a TCPSocket to the hardcoded bare-I

Sources

References

Freshness

Last verified in this catalog Oct 13, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.