CVE-2026-31220
📛 CVE Title
CVE-2026-31220
Description
PySyft (Syft Datasite/Server) versions 0.9.5 and earlier are vulnerable to remote code execution due to insufficient validation and sandboxing of user-submitted code. The system allows low-privileged users to submit Python functions (via @sy.syft_function()) for remote execution on the server. While a code approval mechanism exists, the submitted code undergoes no security checks for dangerous operations (e.g., file access, command execution). Once approved, the code is executed within the server process using exec() and eval() functions without proper isolation. A remote attacker can leverage this to execute arbitrary Python code on the server, leading to complete compromise of the server environment.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- mitre
- CVSS severity
- critical
- CVSS score
- 9.8 / 10
- CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Effective score
- 9.8 / 10 CRITICAL source: CNA overview
- CWE(s)
- —
- Reserved
- 2026-03-09
- Published
- 2026-05-12 00:00 UTC
- Last updated
- 2026-05-15 18:05 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31220.json
- Linked Threat
- CVE-2026-31220 — CVE-2026-31220
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-12 16:16:13 UTC
- NVD last modified
- 2026-05-15 19:16:57 UTC
- NVD CVSS v3.1
- 9.8 / 10 CRITICAL source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 5.9 / 10
- EPSS score
- 0.0031 (probability of exploitation in next 30 days)
- EPSS percentile
- 54.64% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD-assigned CWE(s):
CWE-94
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-05-25 03:35 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-29504 - Assigner
- mitre
- Published
- May 12, 2026, 12:00:00 AM
- Updated
- May 15, 2026, 6:05:42 PM
- EUVD base score (CVSS 3.1)
-
9.8 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EUVD-reported EPSS
- 0.3100
- Vendors
- n/a
- Products
-
n/a (n/a)
ENISA description: PySyft (Syft Datasite/Server) versions 0.9.5 and earlier are vulnerable to remote code execution due to insufficient validation and sandboxing of user-submitted code. The system allows low-privileged users to submit Python functions (via @sy.syft_function()) for remote execution on the server. While a code approval mechanism exists, the submitted code undergoes no security checks for dangerous operations (e.g., file access, command execution). Once approved, the code is executed within the server process using exec() and eval() functions without proper isolation. A remote attacker can leverage this to execute arbitrary Python code on the server, leading to complete compromise of the server environment.
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| n/a | n/a |
n/a (affected)
|
— |
Vendor references (2)
References embedded in the original CVE record by the assigning CNA.
Web references (5)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://github.com/OpenMined/PySyft tenable:github.com
- https://nvd.nist.gov/vuln/detail/CVE-2026-31220 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-31220 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
- https://www.notion.so/CVE-2026-31220-35d1e1393188814186b9e00114a8aba7 tenable:www.notion.so
NVD-tagged references (2)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://github.com/OpenMined/PySyft cve@mitre.org
- https://www.notion.so/CVE-2026-31220-35d1e1393188814186b9e00114a8aba7 cve@mitre.org
Remediations (20)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.qualys.com
With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.
2026-05-23 21:45 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-05-23 21:45 UTC -
web:krebsonsecurity.com
Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.
2026-05-23 21:45 UTC -
web:oradba.ch
19c 26ai cve oracle-cpu patch -management release-update security Oracle CPU April 2026 : Delayed RUs & First Analysis On April 21, 2026 , Oracle released the Critical Patch Update (CPU) for April 2026 — 481 new security fixes across the entire Oracle product stack. For Oracle Database, this means another round of mandatory patching.
2026-05-23 21:45 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-23 21:45 UTC -
web:www.cisecurity.org
<p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...
2026-05-23 21:45 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-05-23 21:45 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-05-23 21:45 UTC -
web:www.windowslatest.com
Windows 11 March 2026 Patch Tuesday update adds Emoji 16.0, Sysmon, network speed test, reliability improvements, and security fixes.
2026-05-23 21:45 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-05-23 21:45 UTC -
web:epatch.pa.gov
Why does PATCH exist? Its purpose is to better enable the public to obtain criminal history record checks. The repository was created and is maintained in accordance with Pennsylvania's Criminal History Information Act contained in Chapter 91 of Title 18, Crimes Code. This Act also directs the Pennsylvania State Police (PSP) to disseminate criminal history data to criminal justice agencies ...
2026-05-26 02:53 UTC -
web:github.com
FH6 bypass for RX580. Contribute to yopzman/FH6_RX580_FIX development by creating an account on GitHub.
2026-05-26 02:53 UTC -
web:patch.com
Joliet Latest Headlines: Fatal Wrong-Way Crash With Semi Closes Westbound I-80: Police; Dog's Cruel, Inhumane Death | Repeat LEGO Thief | Mayo Spill Snarls Traffic: Illinois News; Obituary: Robert ...
2026-05-26 02:53 UTC -
web:patchnashville.com
Patch was born out of a love of children's fashion and classic yet modern gifting. The goal was to create a timeless yet modern boutique with a playful touch featuring children's clothing, gifts, & accessories. My hope is that you always find what you came for and feel as inspired by our collections as we are.
2026-05-26 02:53 UTC -
web:robertsspaceindustries.com
Hi Everyone! Time again for another Hotfix Central thread to keep you all up to date on things going on outside of the normal patch cycle in SC Alpha 4.8 LIVE! This will be a living document of...
2026-05-26 02:53 UTC -
web:support.microsoft.com
The April 14, 2026 update for Windows Server 2022 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections. Summary Security Improvements CVE - 2026 -32178 - .NET Framework Remote Code Execution ...
2026-05-26 02:53 UTC -
web:www.bleepingcomputer.com
Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.
2026-05-26 02:53 UTC -
web:www.cve.org
At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures
2026-05-26 02:53 UTC -
web:www.fixferreterias.com
FIX FERRETERÍAS inicia con la emisión de CFDI 4.0, si tienes una cuenta registrada es necesario que actualices tus datos fiscales: 1.-Inicia sesión 2.- Entra al apartado Mi Cuenta 3.- Dentro de Datos de Facturación da click en cambiar dirección de facturación y posteriormente en Guardar Dirección. Los datos obligatorios son: RFC
2026-05-26 02:53 UTC -
web:www.leagueoflegends.com
League of Legends Patch 26.5 Notes Welcome to the official patch of First Stand, the first major international tournament of the year!
2026-05-26 02:53 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-31220.json.
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