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Malicious code in pafex (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 pafex

    Affected
    >= 2.3, <= 2.3
    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 (f048e6c59bed3c95094e9baaf28b7234a917300b81a4c81db0eb0a3f859ff4e3) No install-time or import-time network I/O, credential access, subprocess execution, or other installer-harm behavior was observed in this package version. No lifecycle hooks performing privileged or external actions, no.pth side effects, and no evidence of exfiltration, dropper, backdoor, or silent-relay patterns.

Source: kam193 (8ad1f51a6f081ac9e46b3d3ffa2d0b9b150b1600caf826d940f4e3d1992cda16) In this campaign, the main package (resion) has an embeded pickle disguised as a config. A related dependency (pafex) contains code to load the pickle. During unpickling, malicious code embeded in the pickle file is automatically executed. It then establishes persistence via a PTH file and downloads the next stage payload. During analysis, the final remote payload was just a stub --- Category: MALICIOUS - The campaign has clearly…

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

    Published from osv record MAL-2026-18094

Agent brief

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# Patch Next advisory brief: mal-2026-18094

Advisory: Malicious code in pafex (PyPI)
IDs: mal-2026-18094
Record: https://patchnext.com/advisories/mal-2026-18094 (revision 1, source checked 30 Oct 2026, 06:40 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 pafex: affected >= 2.3, <= 2.3

## Suggested inspection (read-only)
- `python -m pip show pafex`: 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 pafex.
- 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-2026-18094 (OSV record MAL-2026-18094 lists affected ranges: PyPI pafex >=2.3 <=2.3)

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