Vulnerability-Lookup

CVE-2026-106440 (GCVE-0-2026-106440)

Vulnerability from cvelistv5 – Published: 2026-10-06 18:51 – Updated: 2026-10-06 18:51

Title

Hydra: Optuna custom_search_space can resolve and execute untrusted callables via get_method

Summary

Hydra is a framework for elegantly configuring complex applications. From 1.2.0 until 1.3.0 and 1.4.0.dev10, the hydra-optuna-sweeper package accepts a configuration-controlled dotted path in hydra.sweeper.custom_search_space, resolves it with hydra.utils.get_method(), and later invokes the returned callable in the Hydra controller process. Because get_method() is a trusted-input lookup helper and does not apply the execution policy used by instantiate(), an attacker who controls Optuna sweep configuration or command-line overrides can select importable Python code for execution with the application's privileges, including bypassing a trusted execution whitelist on affected Hydra 1.4 development releases. This issue is fixed in versions 1.3.0 and 1.4.0.dev10.

Severity

7.8 (High)


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

CWE

CWE-470 - Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

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/commit/0…	x_refsource_MISC
https://github.com/hydra-ecosystem/hydra/commit/4…	x_refsource_MISC
https://github.com/hydra-ecosystem/hydra/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
hydra-ecosystem	hydra	Affected: >= 1.2.0, < 1.3.0 Affected: >= 1.4.0.dev4, < 1.4.0.dev10	guessed

Show details on NVD website

JSON

To clipboard

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            "source": "security-advisories@github.com",
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      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
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}

FKIE_CVE-2026-106440

Vulnerability from fkie_nvd - Published: 2026-10-06 19:18 - Updated: 2026-10-06 20:03

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/0dd18084589a3d3e577d1f1a8a48fb485c94a5e6
	security-advisories@github.com	https://github.com/hydra-ecosystem/hydra/commit/4720dfca2bde27fa140ec287a05709668fbdf168
	security-advisories@github.com	https://github.com/hydra-ecosystem/hydra/releases/tag/v1.3.7
	security-advisories@github.com	https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-5jjj-9xc3-rm56

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "hydra",
          "vendor": "hydra-ecosystem",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.2.0, \u003c 1.3.0"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.4.0.dev4, \u003c 1.4.0.dev10"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Hydra is a framework for elegantly configuring complex applications. From 1.2.0 until 1.3.0 and 1.4.0.dev10, the hydra-optuna-sweeper package accepts a configuration-controlled dotted path in hydra.sweeper.custom_search_space, resolves it with hydra.utils.get_method(), and later invokes the returned callable in the Hydra controller process. Because get_method() is a trusted-input lookup helper and does not apply the execution policy used by instantiate(), an attacker who controls Optuna sweep configuration or command-line overrides can select importable Python code for execution with the application\u0027s privileges, including bypassing a trusted execution whitelist on affected Hydra 1.4 development releases. This issue is fixed in versions 1.3.0 and 1.4.0.dev10."
    }
  ],
  "id": "CVE-2026-106440",
  "lastModified": "2026-10-06T20:03:40.690",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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  "published": "2026-10-06T19:18:12.877",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/0dd18084589a3d3e577d1f1a8a48fb485c94a5e6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/4720dfca2bde27fa140ec287a05709668fbdf168"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/hydra-ecosystem/hydra/releases/tag/v1.3.7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-5jjj-9xc3-rm56"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-470"
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      "source": "security-advisories@github.com",
      "type": "Primary"
    }
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}

GHSA-5JJJ-9XC3-RM56

Vulnerability from github – Published: 2026-10-07 20:24 – Updated: 2026-10-07 20:24

Summary

Hydra: Optuna custom_search_space can resolve and execute untrusted callables via get_method

Details

Summary

hydra-optuna-sweeper accepted a configuration-controlled dotted path in hydra.sweeper.custom_search_space, resolved it with the lower-level hydra.utils.get_method() API, and later invoked the returned callable.

Hydra's object-lookup helpers intentionally trust their input and do not apply the execution policy used by instantiate() and logging configuration. As a result, untrusted Optuna multirun configuration could select installed Python code for execution in the Hydra controller process.

Impact

Exploitation requires control of an application's Optuna sweep configuration or command-line overrides and an importable callable in the application's environment. Selected code runs with the privileges of the application.

On affected Hydra 1.4 development releases, this path bypasses an execution whitelist provided by trusted application code. Hydra 1.3 has no execution-whitelist security boundary; there, the same change restores the legacy blocklist as defense in depth.

Fix

The Optuna sweeper now resolves the configured callback through hydra.utils.instantiate() as a partial callable. On Hydra 1.4, the active execution whitelist therefore authorizes the callback before use. On Hydra 1.3, the legacy blocklist is applied as defense in depth.

The public get_object(), get_method(), get_static_method(), and get_class() helpers remain lower-level trusted-input APIs. Their documentation now warns against passing values derived from untrusted configuration and directs config-driven construction to instantiate().

Affected versions

Package: hydra-optuna-sweeper
Stable affected range: >= 1.2.0, < 1.3.0
Stable fixed version: 1.3.0
Development affected range: >= 1.4.0.dev4, < 1.4.0.dev10
Development fixed version: 1.4.0.dev10

The feature was introduced in 1.2.0 and is absent from the 1.1 release line. The 1.4 development line was affected from 1.4.0.dev4 through 1.4.0.dev9.

Workaround

Treat Optuna sweep configuration and command-line overrides as trusted. Do not set custom_search_space from externally controlled input or allow untrusted users to place modules on the application import path.

Reported by zx (GitHub: @manus-pi).

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

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "hydra-optuna-sweeper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.2.0"
            },
            {
              "fixed": "1.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "hydra-optuna-sweeper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.4.0.dev4"
            },
            {
              "fixed": "1.4.0.dev10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-106440"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-470"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T20:24:02Z",
    "nvd_published_at": "2026-10-06T19:18:12Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\n`hydra-optuna-sweeper` accepted a configuration-controlled dotted path in\n`hydra.sweeper.custom_search_space`, resolved it with the lower-level\n`hydra.utils.get_method()` API, and later invoked the returned callable.\n\nHydra\u0027s object-lookup helpers intentionally trust their input and do not apply\nthe execution policy used by `instantiate()` and logging configuration. As a\nresult, untrusted Optuna multirun configuration could select installed Python\ncode for execution in the Hydra controller process.\n\n## Impact\n\nExploitation requires control of an application\u0027s Optuna sweep configuration\nor command-line overrides and an importable callable in the application\u0027s\nenvironment. Selected code runs with the privileges of the application.\n\nOn affected Hydra 1.4 development releases, this path bypasses an execution\nwhitelist provided by trusted application code. Hydra 1.3 has no execution-whitelist\nsecurity boundary; there, the same change restores the legacy blocklist as\ndefense in depth.\n\n## Fix\n\nThe Optuna sweeper now resolves the configured callback through\n`hydra.utils.instantiate()` as a partial callable. On Hydra 1.4, the active\nexecution whitelist therefore authorizes the callback before use. On Hydra\n1.3, the legacy blocklist is applied as defense in depth.\n\nThe public `get_object()`, `get_method()`, `get_static_method()`, and\n`get_class()` helpers remain lower-level trusted-input APIs. Their documentation\nnow warns against passing values derived from untrusted configuration and\ndirects config-driven construction to `instantiate()`.\n\n## Affected versions\n\n- Package: `hydra-optuna-sweeper`\n- Stable affected range: `\u003e= 1.2.0, \u003c 1.3.0`\n- Stable fixed version: `1.3.0`\n- Development affected range: `\u003e= 1.4.0.dev4, \u003c 1.4.0.dev10`\n- Development fixed version: `1.4.0.dev10`\n\nThe feature was introduced in `1.2.0` and is absent from the 1.1 release line.\nThe 1.4 development line was affected from 1.4.0.dev4 through 1.4.0.dev9.\n\n## Workaround\n\nTreat Optuna sweep configuration and command-line overrides as trusted. Do not\nset `custom_search_space` from externally controlled input or allow untrusted\nusers to place modules on the application import path.\n\nReported by zx (GitHub: @manus-pi).",
  "id": "GHSA-5jjj-9xc3-rm56",
  "modified": "2026-10-07T20:24:02Z",
  "published": "2026-10-07T20:24:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-5jjj-9xc3-rm56"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106440"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/0dd18084589a3d3e577d1f1a8a48fb485c94a5e6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/4720dfca2bde27fa140ec287a05709668fbdf168"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/hydra-ecosystem/hydra"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/releases/tag/v1.3.7"
    }
  ],
  "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: Optuna custom_search_space can resolve and execute untrusted callables via get_method"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-106440 (GCVE-0-2026-106440)

FKIE_CVE-2026-106440

GHSA-5JJJ-9XC3-RM56

Summary

Impact

Fix

Affected versions

Workaround

Tags

Sightings

Nomenclature

Related by attack behaviour