CVE-2026-39888

CRITICALNVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 61% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.9Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

PraisonAI is a multi-agent teams system. Prior to 1.5.115, execute_code() in praisonaiagents.tools.python_tools defaults to sandbox_mode="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 (blocked_attrs of python_tools.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 (__traceback__, tb_frame, f_back, and f_builtins). 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. This vulnerability is fixed in 1.5.115.

CVSS v3
9.9
EG Score
9.9(medium)
EG Risk
61(Track*)
EG Risk 61/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity99% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

April 8, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Aug 22, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Sandbox escape via exception frame traversal in `execute_code` (subprocess mode) · Advisory · MervinPraison/PraisonAI · GitHub

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-qf73-2hrx-xprp

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
praisonaiagents0.0.1 ... 1.5.99 (494 versions)1.5.115—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 137 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-20 22:55 UTCEPSS rescore
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  6. 2026-08-18 13:48 UTCEPSS rescore
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  9. 2026-08-16 07:17 UTCEG score recompute
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  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-07 18:20 UTCEG score recompute
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  1. 2026-08-06 17:34 UTCEG score recompute
  2. 2026-08-06 13:46 UTCEPSS rescore
  3. 2026-08-05 23:50 UTCEG score recompute
  4. 2026-08-05 19:17 UTCEPSS rescore
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  7. 2026-08-03 22:05 UTCEG score recompute
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  10. 2026-08-02 02:27 UTCEPSS rescore
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  20. 2026-07-24 14:17 UTCEPSS rescore
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  22. 2026-07-23 14:18 UTCEPSS rescore
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  24. 2026-07-23 03:10 UTCEG score recompute
  25. 2026-07-22 14:08 UTCEPSS rescore
  26. 2026-07-21 15:24 UTCEPSS rescore
  27. 2026-07-20 17:08 UTCEPSS rescore
  28. 2026-07-19 14:31 UTCEPSS rescore
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  40. 2026-07-09 19:10 UTCEPSS rescore
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  42. 2026-07-07 13:46 UTCEPSS rescore
  43. 2026-07-06 16:27 UTCEPSS rescore
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  45. 2026-07-06 02:23 UTCEPSS rescore
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  50. 2026-06-30 23:22 UTCEPSS rescore
  51. 2026-06-29 14:06 UTCEPSS rescore
  52. 2026-06-28 14:07 UTCEPSS rescore
  53. 2026-06-28 04:56 UTCEPSS rescore
  54. 2026-06-27 03:08 UTCEPSS rescore
  55. 2026-06-25 13:49 UTCEPSS rescore
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  57. 2026-06-24 14:05 UTCEPSS rescore
  58. 2026-06-23 21:33 UTCEPSS rescore
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  61. 2026-06-21 14:56 UTCEPSS rescore
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  64. 2026-06-19 19:25 UTCEPSS rescore
  65. 2026-06-18 17:52 UTCEPSS rescore
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  67. 2026-06-17 17:53 UTCEPSS rescore
  68. 2026-06-16 17:52 UTCEPSS rescore
  69. 2026-06-15 17:49 UTCEPSS rescore
  70. 2026-06-14 23:18 UTCEPSS rescore
  71. 2026-06-13 23:00 UTCEPSS rescore
  72. 2026-06-12 23:12 UTCEPSS rescore
  73. 2026-06-12 23:12 UTCEPSS rescore
  74. 2026-06-11 14:00 UTCEPSS rescore
  75. 2026-06-10 22:18 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-39888?
CVE-2026-39888 is a critical vulnerability published on April 8, 2026. PraisonAI is a multi-agent teams system. Prior to 1.5.115, 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…
When was CVE-2026-39888 disclosed?
CVE-2026-39888 was first published in the National Vulnerability Database on April 8, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39888 actively exploited?
CVE-2026-39888 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.0% of all scored CVEs.
What is the CVSS score of CVE-2026-39888?
CVE-2026-39888 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-39888?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39888, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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