PraisonAI has sandbox escape via exception frame traversal in execute_code (subprocess mode)

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.9 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

• CVE-2026-39888: 0.48% estimated exploitation activity in the next 30 days; percentile 41.84 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary executecode() in praisonaiagents.tools.pythontools defaults to sandboxmode="sandbox", which runs user code in a subprocess wrapped with a restricted builtins dict and an AST-based blocklist. The AST blocklist embedded inside the subprocess wrapper (blockedattrs, line 143 of pythontools.py) contains only 11 attribute names — a strict subset of the 30+ names blocked in the direct-execution path. The four attributes that form a frame-traversal chain out of the sandbox are all absent from the subprocess list: | Attribute | In subprocess blockedattrs | In direct-mode blockedattrs | |---|---|---| | traceback | NO | YES | | tbframe | NO | YES | | fback | NO | YES | | fbuiltins | NO | YES | Chaining these attributes through a caught exception exposes the real Python builtins dict of the subprocess wrapper frame, from which exec can be retrieved and called under a non-blocked variable name — bypassing every remaining security layer. Tested and confirmed on praisonaiagents 1.5.113…

Published by the source

8 Apr 2026, 19:17 UTC

Last modified by the source

29 Jun 2026, 12:26 UTC

Source last checked

26 Oct 2026, 13:40 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-qf73-2hrx-xprp

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-qf73-2hrx-xprp

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-qf73-2hrx-xprp

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# Patch Next advisory brief: CVE-2026-39888

Advisory: PraisonAI has sandbox escape via exception frame traversal in `execute_code` (subprocess mode)
IDs: CVE-2026-39888, GHSA-qf73-2hrx-xprp
Record: https://patchnext.com/advisories/cve-2026-39888 (revision 3, source checked 26 Oct 2026, 13:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: praisonaiagents 1.5.115. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI praisonaiagents: affected <= 1.5.114; fixed in 1.5.115

## Suggested inspection (read-only)
- `python -m pip show praisonaiagents`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on praisonaiagents.
- 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://github.com/advisories/GHSA-qf73-2hrx-xprp (GitHub-reviewed advisory GHSA-qf73-2hrx-xprp lists affected ranges: PyPI praisonaiagents >=0 <=1.5.114)
- Verified: https://osv.dev/vulnerability/GHSA-qf73-2hrx-xprp (OSV record GHSA-qf73-2hrx-xprp lists affected ranges: PyPI praisonaiagents >=0 <1.5.115 (fixed))

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