CVE-2026-3071
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedDeserialization of untrusted data in the LanguageModel class of Flair from versions 0.4.1 to latest are vulnerable to arbitrary code execution when loading a malicious model.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe LanguageModel class in Flair versions 0.4.1 through latest contains an insecure deserialization vulnerability. When loading a model from an untrusted source, the vulnerable code deserializes data without proper validation, allowing an attacker to execute arbitrary code by supplying a specially crafted malicious model file.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Flair is installedRun 'pip show flair' or check your Python environment for the flair packageAffected if Flair is not installed, you are not affected
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Determine installed Flair versionRun 'pip show flair' and note the Version field, or import flair and print(flair.__version__)Affected if Version is 0.4.1 or higher (any version from 0.4.1 through the latest release is affected)
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Identify code that loads Flair LanguageModelSearch your codebase for imports of 'flair.nn' and usage of 'LanguageModel' class, particularly any load_from_file or similar loading methodsAffected if Code loads models using LanguageModel class from external or untrusted sources
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Check source of loaded model filesReview all model loading calls and identify whether models are loaded from local trusted files, verifiedpip repositories, or untrusted/network sourcesAffected if Models are loaded from untrusted, unverified, or network sources (this is the attack vector)
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Audit model file sources in your environmentLocate any model files in your project or environment and verify their origin and integrity checksums if possibleAffected if You have model files of unknown or untrusted origin that could be maliciously crafted
You are affected if Flair version 0.4.1 or higher is installed AND your code loads LanguageModel models from untrusted or unverified external sources.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataDo not load Flair models from untrusted or unverified sources. Wait for and apply the official patch when released, which will likely replace the unsafe deserialization mechanism with a safer alternative.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $11,776.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-3071 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-3071 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data