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Critical, CVSS 9.8amended

rpc.py vulnerable to Deserialization of Untrusted Data

CVE-2022-35411GHSA-8rq8-f485-7v8x

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 rpc-py

    Affected
    >= 0.4.2, <= 0.6.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2022-35411: 46.65% estimated exploitation activity in the next 30 days; percentile 98.83 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

rpc.py through 0.6.0 allows Remote Code Execution because an unpickle occurs when the "serializer: pickle" HTTP header is sent. In other words, although JSON (not Pickle) is the default data format, an unauthenticated client can cause the data to be processed with unpickle. Per the maintainer, rpc.py is not designed for an API that is open to the outside world, and external requests cannot reach rpc.py in real world use. A fix exists on the master branch. As a workaround, use the following code to turn off pickle in older versions: del SERIALIZERNAMES[PickleSerializer.name] del SERIALIZERTYPES[PickleSerializer.contenttype]

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-8rq8-f485-7v8x

  2. Revision 1 · created ·

    Published from osv record GHSA-8rq8-f485-7v8x

Agent brief

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

# Patch Next advisory brief: CVE-2022-35411

Advisory: rpc.py vulnerable to Deserialization of Untrusted Data
IDs: CVE-2022-35411, GHSA-8rq8-f485-7v8x
Record: https://patchnext.com/advisories/cve-2022-35411 (revision 2, source checked 26 Oct 2026, 13:13 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
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 rpc-py: affected >= 0.4.2, <= 0.6.0

## Suggested inspection (read-only)
- `python -m pip show rpc-py`: 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 rpc-py.
- 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/GHSA-8rq8-f485-7v8x (OSV record GHSA-8rq8-f485-7v8x lists affected ranges: PyPI rpc-py >=0.4.2 <=0.6.0)
- Verified: https://github.com/advisories/GHSA-8rq8-f485-7v8x (GitHub-reviewed advisory GHSA-8rq8-f485-7v8x lists affected ranges: PyPI rpc-py >=0.4.2 <=0.6.0)

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