CVE-2026-31253
📛 CVE Title
CVE-2026-31253
Description
The flash-attention training framework thru commit e724e2588cbe754beb97cf7c011b5e7e34119e62 (2025-13-04) contains an insecure deserialization vulnerability (CWE-502) in its checkpoint loading mechanism. The load_checkpoint() function in checkpoint.py and the checkpoint loading code in eval.py use torch.load() without enabling the security-restrictive weights_only=True parameter. This allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by providing a maliciously crafted checkpoint file. When a victim loads this checkpoint during model warmstarting or evaluation, arbitrary code is executed on the victim's system.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- mitre
- CVSS severity
- high
- CVSS score
- 7.3 / 10
- CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Effective score
- 7.3 / 10 HIGH source: CNA overview
- CWE(s)
- —
- Reserved
- 2026-03-09
- Published
- 2026-05-11 00:00 UTC
- Last updated
- 2026-05-12 19:32 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31253.json
- Linked Threat
- CVE-2026-31253 — CVE-2026-31253
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
- 2026-05-11 17:16:20 UTC
- NVD last modified
- 2026-05-12 20:16:34 UTC
- NVD CVSS v3.1
- 7.3 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 3.4 / 10
- EPSS score
- 0.0005 (probability of exploitation in next 30 days)
- EPSS percentile
- 14.58% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD-assigned CWE(s):
CWE-94,
CWE-502
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-05-25 03:32 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-2026-29100 - Assigner
- mitre
- Published
- May 11, 2026, 12:00:00 AM
- Updated
- May 12, 2026, 7:32:41 PM
- EUVD base score (CVSS 3.1)
-
7.3 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - EUVD-reported EPSS
- 0.0500
- Vendors
- n/a
- Products
-
n/a (n/a)
ENISA description: The flash-attention training framework thru commit e724e2588cbe754beb97cf7c011b5e7e34119e62 (2025-13-04) contains an insecure deserialization vulnerability (CWE-502) in its checkpoint loading mechanism. The load_checkpoint() function in checkpoint.py and the checkpoint loading code in eval.py use torch.load() without enabling the security-restrictive weights_only=True parameter. This allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by providing a maliciously crafted checkpoint file. When a victim loads this checkpoint during model warmstarting or evaluation, arbitrary code is executed on the victim's system.
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/Dao-AILab/flash-attention tenable:github.com
- https://nvd.nist.gov/vuln/detail/CVE-2026-31253 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-31253 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
- https://www.notion.so/CVE-2026-31253-35d1e1393188813f9e77e2038104bc49 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/Dao-AILab/flash-attention cve@mitre.org
- https://www.notion.so/CVE-2026-31253-35d1e1393188813f9e77e2038104bc49 cve@mitre.org
Remediations (17)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.talosintelligence.com
Microsoft has released its monthly security update for March 2026 which includes 79 vulnerabilities, including three that Microsoft marked as "critical." The remaining vulnerabilities listed are classified as "important." Microsoft assessed that exploitation of the three "critical" vulnerabilities is "less likely." CVE - 2026 -26110 and CVE - 2026 -26113 are "critical" Microsoft ...
2026-05-23 21:46 UTC -
web:blog.talosintelligence.com
Microsoft has released its monthly security update for May 2026 , which includes 137 vulnerabilities affecting a range of products, including 16 that Microsoft marked as "critical".
2026-05-23 21:46 UTC -
web:cybersecuritynews.com
Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026 , addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE - 2026 -21262, the sole zero-day ...
2026-05-23 21:46 UTC -
web:msrc.microsoft.com
The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.
2026-05-23 21:46 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 21:46 UTC -
web:securereading.com
Microsoft has released its May 2026 Patch Tuesday security updates addressing multiple critical vulnerabilities affecting enterprise cloud services, operating systems, virtualization infrastructure, authentication platforms, and business applications.
2026-05-23 21:46 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 21:46 UTC -
web:www.crowdstrike.com
Microsoft's March 2026 Patch Tuesday addresses 82 CVEs , featuring eight Critical vulnerabilities.
2026-05-23 21:46 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 21:46 UTC -
web:www.pcworld.com
This month's Patch Tuesday brings over 80 fixes for various security vulnerabilities. Fortunately, none are actively being exploited in the wild yet.
2026-05-23 21:46 UTC -
web:blog.qualys.com
Microsoft has rolled out its March 2026 Patch Tuesday updates, delivering a fresh batch of security fixes designed to keep Windows environments protected from emerging threats.
2026-05-26 02:52 UTC -
web:krebsonsecurity.com
Microsoft earlier provided patches to address nine browser vulnerabilities, which are not included in the Patch Tuesday count above.
2026-05-26 02:52 UTC -
web:securityaffairs.com
Microsoft Patch Tuesday security updates for March 2026 addressed 84 vulnerabilities across its products. The IT giant addressed flaws across Windows, Office, Edge, Azure, SQL Server, Hyper-V, and ReFS. Including third-party and Chromium updates, the total reaches 94 vulnerabilities. Eight flaws are rated Critical and the rest Important.
2026-05-26 02:52 UTC -
web:www.computerworld.com
Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...
2026-05-26 02:52 UTC -
web:www.secpod.com
The second Tuesday of the month has arrived, bringing another significant wave of Microsoft security updates. In February 2026 , Microsoft issued patches for 58 vulnerabilities, including six actively exploited zero-day flaws and five rated Critical. As part of this month's release, Microsoft has also begun rolling out updated Secure Boot certificates ahead of the June 2026 expiration of the ...
2026-05-26 02:52 UTC -
web:www.techrepublic.com
Microsoft's March Patch Tuesday fixes 78 vulnerabilities, including Office preview pane flaws, an Excel Copilot data leak risk, and an AI-discovered 9.8 severity bug.
2026-05-26 02:52 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.
2026-05-26 02:52 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-31253.json.
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