CVE-2026-3071Public exploit

Arbitrary code execution via unsafe model deserialization

Published Feb 26, 2026 · Updated Feb 26, 2026

Unsafe deserialization in Flair 0.4.1 through 0.15.1 allows local users to execute arbitrary code by loading a malicious language model. LanguageModel.load_language_model passes the model file to torch.load with weights_only=False, enabling pickle object reconstruction and code execution. Exploitation requires control of a model file path consumed by the loading process, and the code runs with that process's privileges.

CVSS severity8.4
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Flair 0.4.1 through 0.15.1 allows local users to execute arbitrary code by loading a malicious language model. LanguageModel.load_language_model passes the model file to torch.load with weights_only=False, enabling pickle object reconstruction and code execution. Exploitation requires control of a model file path consumed by the loading process, and the code runs with that process's privileges.

The record

CVE
CVE-2026-3071
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
flairNLP
Product
Flair
Classifications
CWE-502, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.4.1 <=*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

flairNLP · Flairversion=0.4.1 <=*

Published CVSS scores

8.4HiddenLayerCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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