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Vulnerabilities

Vulnerability · MAL-2026-17866

Malicious code in pyyi (PyPI)

Published Oct 12, 2026 · catalog updated Oct 16, 2026 · Malicious code in pyyi

Open the advisory

Exploitation likelihood is not on this record for MAL-2026-17866. A missing EPSS score is not a low risk. Compare Malicious code in pyyi 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 pyyi).
  • 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
PyPI pyyi

The verified PyPI wheel declares a console command named python2 (pyyi.cli:main). For commands other than the local REPL, help, version, unlock, or uninstall paths, it obtains configuration and calls run_payload(). Registration sends the hostname and OS to a configured space-z.ai server and stores the returned apiKey in ~/.python2/config.json. The REPL presents a normal Python banner but silently sends eligible single-token inputs to /api/cli/unlock as the password field, subject to filtering and attempt limits. run_payload() fetches code from /api/cli/payload, base64-decodes and gzip-decompresses it, then executes it in memory using exec(compile(src, ' ', 'exec'), g) at pyyi/cli.py:640 and calls its main function. Loader failures are disguised as Python's can't open file error. The malicious assessment is based on the combination of interpreter impersonation, concealed input transmission, remote code execution, and deliberate failure concealment, rather than encoding or exec alone. Static review and isolated, network-disabled mock tests confirmed the input-to-request and response-to-execution data flows using synthetic canaries and payloads. No live endpoint was contacted, and the actual server-supplied payload and its subsequent behavior remain unknown. Wheel SHA-256: 003828175a747a9a3de8029e6a028ad2c3739abf1dad7b468b25636e391e91f4. --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (7ac60870a568a1e1336d1d1696b9129a0f8bc13da7395fc24ed23ec4e8bf791e) The package registers a console_scripts entry named and presents a convincing fake 'Python on ' REPL banner so the shell is indistinguishable from the real CPython 2 interpreter. On first invocation it POSTs the machine hostname and OS/platform to a hardcoded server at https://preview-chat-960504a9-b4e0-4b69-bc80-6ac3d4fa4ae0.space-z.ai (and https://b196q82k8891-d.space-z.ai) under /api/cli/init to enroll the host and receive an apiKey stored in ~/.python2/state.json. The CLI then fe

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.

  • PyPI pyyi2.4.1
  • PyPI pyyi2.4.1, 2.4.2, 2.4

How to fix MAL-2026-17866

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-2026-17866. A missing EPSS score is not a low risk. Compare Malicious code in pyyi with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 2.4.1, 2.4.1, 2.4.2, 2.4. 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 12, 2026 · Catalog

    Detected

    The verified PyPI wheel declares a console command named python2 (pyyi.cli:main). For commands other than the local REPL, help, version, unlock, or uninstall paths, it obtains configuration and calls run_payload(). Registration sends the hostname and OS to a configured space-z.ai server and stores the returned apiKey in ~/.python2/config.json. The REPL presents a normal Python banner but silently

  2. Oct 14, 2026 · Catalog

    Updated

    The verified PyPI wheel declares a console command named python2 (pyyi.cli:main). For commands other than the local REPL, help, version, unlock, or uninstall paths, it obtains configuration and calls run_payload(). Registration sends the hostname and OS to a configured space-z.ai server and stores the returned apiKey in ~/.python2/config.json. The REPL presents a normal Python banner but silently

  3. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    The verified PyPI wheel declares a console command named python2 (pyyi.cli:main). For commands other than the local REPL, help, version, unlock, or uninstall paths, it obtains configuration and calls run_payload(). Registration sends the hostname and OS to a configured space-z.ai server and stores the returned apiKey in ~/.python2/config.json. The REPL presents a normal Python banner but silently

Sources

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.