Vulnerability-Lookup

CVE-2026-106441 (GCVE-0-2026-106441)

Vulnerability from cvelistv5 – Published: 2026-10-06 18:53 – Updated: 2026-10-07 18:49

Title

Hydra logging configuration permits unsafe callable resolution

Summary

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-07 18:49 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/hydra-ecosystem/hydra/security…	x_refsource_CONFIRM
https://github.com/hydra-ecosystem/hydra/pull/3420	x_refsource_MISC
https://github.com/hydra-ecosystem/hydra/commit/7…	x_refsource_MISC
https://github.com/hydra-ecosystem/hydra/commit/f…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
hydra-ecosystem	hydra	Affected: < 1.3.6 Affected: >= 1.4.0.dev0, < 1.4.0.dev9	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-106441

Vulnerability from fkie_nvd - Published: 2026-10-06 19:18 - Updated: 2026-10-07 19:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

References

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

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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      "affectedData": [
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          "product": "hydra",
          "vendor": "hydra-ecosystem",
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            {
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GHSA-C3WX-C55W-PXJQ

Vulnerability from github – Published: 2026-10-07 18:03 – Updated: 2026-10-07 18:03

Summary

Hydra logging configuration permits unsafe callable resolution

Details

Summary

Hydra passed its Python logging configuration to logging.config.dictConfig(). Python's logging configurator can resolve and invoke importable classes and factories named by configuration, including handler class values and formatter, filter, handler, queue, and listener () factories.

This logging path was not mediated by Hydra's target policy. In versions that already protected instantiate(), logging resolution bypassed those controls because it did not use instantiate().

An attacker who can control a Hydra logging configuration can use a custom class or factory to execute code with the application's privileges when Hydra configures logging.

Fix

Hydra now applies its target policy to callable resolution and invocation in Hydra-configured Python logging. It authorizes custom factories, handlers, formatters, filters, queues, listeners, aliases, discovery results, and callable results before they can be used.

Hydra 1.3.6 uses the hardened blacklist. The Hydra 1.3 blacklist is a best-effort, defense-in-depth measure. It is not a complete security boundary and does not make untrusted logging configuration safe.

Hydra 1.4.0.dev9 introduces the execution whitelist as the recommended primary boundary, with the blacklist retained as a deprecated compatibility fallback. When an execution whitelist is supplied, Hydra automatically permits targets used by its built-in logging configurations, while custom logging integrations must be explicitly authorized by trusted Python code. If no whitelist is supplied, Hydra warns and preserves legacy fallback behavior.

Remediation

Upgrade to Hydra 1.3.6, or to Hydra 1.4.0.dev9 or later when testing the 1.4 prerelease line.

On Hydra 1.3, do not compose logging configuration from untrusted sources. On Hydra 1.4 and later, constrain custom logging targets with a narrow execution whitelist supplied by trusted Python code. The execution whitelist controls callable selection; it is not general validation of all logging settings.

For Hydra 1.4 execution-whitelist configuration, see:

https://hydra.cc/docs/advanced/execution_whitelist/

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

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      "package": {
        "ecosystem": "PyPI",
        "name": "hydra-core"
      },
      "ranges": [
        {
          "events": [
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            {
              "fixed": "1.3.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "hydra-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.4.0.dev0"
            },
            {
              "fixed": "1.4.0.dev9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-106441"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T18:03:55Z",
    "nvd_published_at": "2026-10-06T19:18:13Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nHydra passed its Python logging configuration to `logging.config.dictConfig()`. Python\u0027s logging configurator can resolve and invoke importable classes and factories named by configuration, including handler `class` values and formatter, filter, handler, queue, and listener `()` factories.\n\nThis logging path was not mediated by Hydra\u0027s target policy. In versions that already protected `instantiate()`, logging resolution bypassed those controls because it did not use `instantiate()`.\n\nAn attacker who can control a Hydra logging configuration can use a custom class or factory to execute code with the application\u0027s privileges when Hydra configures logging.\n\n## Fix\n\nHydra now applies its target policy to callable resolution and invocation in Hydra-configured Python logging. It authorizes custom factories, handlers, formatters, filters, queues, listeners, aliases, discovery results, and callable results before they can be used.\n\nHydra 1.3.6 uses the hardened blacklist. The Hydra 1.3 blacklist is a best-effort, defense-in-depth measure. It is not a complete security boundary and does not make untrusted logging configuration safe.\n\nHydra 1.4.0.dev9 introduces the execution whitelist as the recommended primary boundary, with the blacklist retained as a deprecated compatibility fallback. When an execution whitelist is supplied, Hydra automatically permits targets used by its built-in logging configurations, while custom logging integrations must be explicitly authorized by trusted Python code. If no whitelist is supplied, Hydra warns and preserves legacy fallback behavior.\n\n## Remediation\n\nUpgrade to Hydra 1.3.6, or to Hydra 1.4.0.dev9 or later when testing the 1.4 prerelease line.\n\nOn Hydra 1.3, do not compose logging configuration from untrusted sources. On Hydra 1.4 and later, constrain custom logging targets with a narrow execution whitelist supplied by trusted Python code. The execution whitelist controls callable selection; it is not general validation of all logging settings.\n\nFor Hydra 1.4 execution-whitelist configuration, see:\n\nhttps://hydra.cc/docs/advanced/execution_whitelist/",
  "id": "GHSA-c3wx-c55w-pxjq",
  "modified": "2026-10-07T18:03:55Z",
  "published": "2026-10-07T18:03:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-c3wx-c55w-pxjq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106441"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/pull/3420"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/76bfc30ce1f3105416941dd2e3a562568e369120"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/ff3e4dba890c29a21d8c2bb867ee87d37ccf21d0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/hydra-ecosystem/hydra"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/releases/tag/v1.3.6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hydra logging configuration permits unsafe callable resolution"
}

Sightings

Author	Source	Type	Date	Other

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-106441 (GCVE-0-2026-106441)

FKIE_CVE-2026-106441

GHSA-C3WX-C55W-PXJQ

Summary

Fix

Remediation

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