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Vulnerability Details :

CVE-2026-31253

Summary
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At-11 May, 2026 | 00:00
Updated At-12 May, 2026 | 19:32
Rejected At-
Credits

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.

Vendors
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Not available
Products
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Metrics (CVSS)
VersionBase scoreBase severityVector
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References
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EPSS History
Score
Latest Score
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N/A
No data available for selected date range
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No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:mitre
Assigner Org ID:8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At:11 May, 2026 | 00:00
Updated At:12 May, 2026 | 19:32
Rejected At:
▼CVE Numbering Authority (CNA)

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
Vendor
n/a
Product
n/a
Versions
Affected
  • n/a
Problem Types
TypeCWE IDDescription
textN/An/a
Type: text
CWE ID: N/A
Description: n/a
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/Dao-AILab/flash-attention
N/A
https://www.notion.so/CVE-2026-31253-35d1e1393188813f9e77e2038104bc49
N/A
Hyperlink: https://github.com/Dao-AILab/flash-attention
Resource: N/A
Hyperlink: https://www.notion.so/CVE-2026-31253-35d1e1393188813f9e77e2038104bc49
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-502CWE-502 Deserialization of Untrusted Data
CWECWE-94CWE-94 Improper Control of Generation of Code ('Code Injection')
Type: CWE
CWE ID: CWE-502
Description: CWE-502 Deserialization of Untrusted Data
Type: CWE
CWE ID: CWE-94
Description: CWE-94 Improper Control of Generation of Code ('Code Injection')
Metrics
VersionBase scoreBase severityVector
3.17.3HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Version: 3.1
Base score: 7.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve@mitre.org
Published At:11 May, 2026 | 17:16
Updated At:12 May, 2026 | 20:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.3HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Type: Secondary
Version: 3.1
Base score: 7.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-94Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE-502Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-94
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-502
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/Dao-AILab/flash-attentioncve@mitre.org
N/A
https://www.notion.so/CVE-2026-31253-35d1e1393188813f9e77e2038104bc49cve@mitre.org
N/A
Hyperlink: https://github.com/Dao-AILab/flash-attention
Source: cve@mitre.org
Resource: N/A
Hyperlink: https://www.notion.so/CVE-2026-31253-35d1e1393188813f9e77e2038104bc49
Source: cve@mitre.org
Resource: N/A

Change History

0
Information is not available yet

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