Vulnerability-Lookup

CVE-2026-106442 (GCVE-0-2026-106442)

Vulnerability from cvelistv5 – Published: 2026-10-06 18:55 – Updated: 2026-10-07 14:14

Title

Hydra instantiate target blacklist bypasses permit code execution

Summary

Hydra is a framework for elegantly configuring complex applications. From 1.3.4 until 1.3.6 and 1.4.0.dev9, the instantiate() target blacklist introduced for CVE-2026-68508 incompletely checks the effective callable selected by the target field. Execution wrappers such as timeit.timeit, executable deserialization through pickle.loads, aliases, callable-returning helpers, generic dispatch, and deferred calls can obscure or defer the effective target and bypass name-based authorization. An attacker who causes an application to instantiate untrusted Hydra configuration can use these gaps to execute code with the application's privileges. 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 14:12 UTC

CWE

CWE-184 - Incomplete List of Disallowed Inputs

Assigner

GitHub_M mitre root Scorecard

References

6 references

URL	Tags
https://github.com/hydra-ecosystem/hydra/security…	x_refsource_CONFIRM
https://github.com/hydra-ecosystem/hydra/pull/3412	x_refsource_MISC
https://github.com/hydra-ecosystem/hydra/pull/3413	x_refsource_MISC
https://github.com/hydra-ecosystem/hydra/commit/2…	x_refsource_MISC
https://github.com/hydra-ecosystem/hydra/commit/f…	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: >= 1.3.4, < 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-2026-106442

Vulnerability from fkie_nvd - Published: 2026-10-06 19:18 - Updated: 2026-10-07 15:17

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/2c82bbb3f39603b336cb852461739fdf7a38798a
	security-advisories@github.com	https://github.com/hydra-ecosystem/hydra/commit/f462811117b5ecfd2ed652ed52d6b4e3771bd943
	security-advisories@github.com	https://github.com/hydra-ecosystem/hydra/pull/3412
	security-advisories@github.com	https://github.com/hydra-ecosystem/hydra/pull/3413
	security-advisories@github.com	https://github.com/hydra-ecosystem/hydra/releases/tag/v1.3.6
	security-advisories@github.com	https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-rqx7-p7vv-w7hr

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "product": "hydra",
          "vendor": "hydra-ecosystem",
          "versions": [
            {
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              "version": "\u003e= 1.3.4, \u003c 1.3.6"
            },
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            }
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    }
  ],
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    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-rqx7-p7vv-w7hr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-184"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-RQX7-P7VV-W7HR

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

Summary

Hydra instantiate target blacklist bypasses permit code execution

Details

Summary

Hydra's instantiate() API resolves and invokes Python callables named by the _target_ field in configuration. The target blacklist introduced for CVE-2026-68508 was incomplete.

Representative bypasses included execution wrappers such as timeit.timeit, executable deserialization through pickle.loads, and generic dispatch or wrapper targets that obscured the effective callable. Target aliases, callable-returning helpers, and deferred dispatch could similarly bypass name-based checks.

An attacker who can cause an application to instantiate an untrusted Hydra configuration can use these gaps to execute code with the application's privileges.

Fix

Hydra 1.3.6 expands and hardens the blacklist used by the 1.3 compatibility line. It blocks the reported execution and deserialization surfaces, checks canonical callable identities and aliases, mediates callable results, and blocks generic dispatch and wrapper targets that bypass immediate target checks.

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 configuration safe to instantiate.

Hydra 1.4.0.dev9 applies the same hardening and introduces the execution whitelist as the recommended primary security boundary. When a whitelist is supplied, targets are rejected unless trusted Python code authorizes them. If no whitelist is supplied, Hydra preserves legacy behavior with a deprecation warning and the blacklist as a best-effort compatibility fallback. Targets that permit configuration to select or supply executable behavior remain non-whitelistable.

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 instantiate configuration from untrusted sources. On Hydra 1.4 and later, constrain untrusted configuration with a narrow execution whitelist supplied by trusted Python code.

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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "hydra-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.3.4"
            },
            {
              "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-2026-106442"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-184"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T18:03:49Z",
    "nvd_published_at": "2026-10-06T19:18:13Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nHydra\u0027s `instantiate()` API resolves and invokes Python callables named by the `_target_` field in configuration. The target blacklist introduced for CVE-2026-68508 was incomplete.\n\nRepresentative bypasses included execution wrappers such as `timeit.timeit`, executable deserialization through `pickle.loads`, and generic dispatch or wrapper targets that obscured the effective callable. Target aliases, callable-returning helpers, and deferred dispatch could similarly bypass name-based checks.\n\nAn attacker who can cause an application to instantiate an untrusted Hydra configuration can use these gaps to execute code with the application\u0027s privileges.\n\n## Fix\n\nHydra 1.3.6 expands and hardens the blacklist used by the 1.3 compatibility line. It blocks the reported execution and deserialization surfaces, checks canonical callable identities and aliases, mediates callable results, and blocks generic dispatch and wrapper targets that bypass immediate target checks.\n\nThe Hydra 1.3 blacklist is a best-effort, defense-in-depth measure. It is not a complete security boundary and does not make untrusted configuration safe to instantiate.\n\nHydra 1.4.0.dev9 applies the same hardening and introduces the execution whitelist as the recommended primary security boundary. When a whitelist is supplied, targets are rejected unless trusted Python code authorizes them. If no whitelist is supplied, Hydra preserves legacy behavior with a deprecation warning and the blacklist as a best-effort compatibility fallback. Targets that permit configuration to select or supply executable behavior remain non-whitelistable.\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 instantiate configuration from untrusted sources. On Hydra 1.4 and later, constrain untrusted configuration with a narrow execution whitelist supplied by trusted Python code.\n\nFor Hydra 1.4 execution-whitelist configuration, see: https://hydra.cc/docs/advanced/execution_whitelist/",
  "id": "GHSA-rqx7-p7vv-w7hr",
  "modified": "2026-10-07T18:03:49Z",
  "published": "2026-10-07T18:03:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/security/advisories/GHSA-rqx7-p7vv-w7hr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106442"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/pull/3412"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/pull/3413"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/2c82bbb3f39603b336cb852461739fdf7a38798a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hydra-ecosystem/hydra/commit/f462811117b5ecfd2ed652ed52d6b4e3771bd943"
    },
    {
      "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 instantiate target blacklist bypasses permit code execution"
}

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.
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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.
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Action not permitted

CVE-2026-106442 (GCVE-0-2026-106442)

FKIE_CVE-2026-106442

GHSA-RQX7-P7VV-W7HR

Summary

Fix

Remediation

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