CVE-2026-94206 (GCVE-0-2026-94206)
Vulnerability from cvelistv5 – Published: 2026-10-06 08:38 – Updated: 2026-10-06 11:36
VLAI
EPSS
VEX
Title
Cloak PBKDF2 field ignores the configured iteration count and runs only :size rounds
Summary
Use of Password Hash With Insufficient Computational Effort vulnerability in danielberkompas cloak_ecto and danielberkompas cloak allows an attacker who holds the hashed values and the configured secret to brute-force low-entropy plaintexts much faster than configured.
The dump/1 callback that Cloak.Ecto.PBKDF2 (Cloak.Fields.PBKDF2 in cloak before the Ecto code moved to cloak_ecto) injects into a field module calls :pbkdf2.pbkdf2/4 with config[:size] in the iteration-count position. The :iterations setting is validated but never used. With the cloak_ecto defaults (iterations: 600_000, size: 32) each hash runs 32 PBKDF2 rounds instead of 600,000, so offline guessing of values such as email addresses costs about 18,750 times less than configured.
This issue affects cloak_ecto: from 1.0.0-alpha.0 onward; cloak: from 0.7.0 before 1.0.0-alpha.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 11:34 UTC
CWE
- CWE-916 - Use of Password Hash With Insufficient Computational Effort
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://cna.erlef.org/cves/CVE-2026-94206.html | relatedthird-party-advisory |
| https://osv.dev/vulnerability/EEF-CVE-2026-94206 | related |
| https://github.com/danielberkompas/cloak_ecto/com… | related |
| https://github.com/danielberkompas/cloak/commit/8… | related |
| https://github.com/danielberkompas/cloak/commit/6… | patch |
Impacted products
4 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| danielberkompas | cloak_ecto |
Affected:
1.0.0-alpha.0 , < *
(semver)
cpe:2.3:a:danielberkompas:cloak_ecto:*:*:*:*:*:*:*:* |
||
| danielberkompas | cloak_ecto |
Affected:
a8fa1642b02f1c445a1ee8794c9095eb0921f8f3 , < *
(git)
cpe:2.3:a:danielberkompas:cloak_ecto:*:*:*:*:*:*:*:* |
||
| danielberkompas | cloak |
Affected:
0.7.0 , < 1.0.0-alpha.0
(semver)
cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:* |
||
| danielberkompas | cloak |
Affected:
8699e6417a162c39d9f0ef63511bd23d3f38d1d2 , < 681c9702b7cd9afe0e5a840751ab009f550c69a9
(git)
cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:* |
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"id": "CVE-2026-94206",
"lastModified": "2026-10-06T15:03:59.427",
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"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-94206",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-06T11:34:00.942993Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-10-06T09:17:56.813",
"references": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://cna.erlef.org/cves/CVE-2026-94206.html"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/danielberkompas/cloak/commit/681c9702b7cd9afe0e5a840751ab009f550c69a9"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/danielberkompas/cloak/commit/8699e6417a162c39d9f0ef63511bd23d3f38d1d2"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/danielberkompas/cloak_ecto/commit/a8fa1642b02f1c445a1ee8794c9095eb0921f8f3"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-94206"
}
],
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-916"
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-94206",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-06T11:34:00.942993Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-06T11:34:55.954Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:danielberkompas:cloak_ecto:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Cloak.Ecto.PBKDF2\u0027"
],
"packageName": "cloak_ecto",
"packageURL": "pkg:hex/cloak_ecto",
"product": "cloak_ecto",
"programFiles": [
"lib/cloak_ecto/types/pbkdf2.ex"
],
"repo": "https://github.com/danielberkompas/cloak_ecto",
"vendor": "danielberkompas",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "1.0.0-alpha.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:danielberkompas:cloak_ecto:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Cloak.Ecto.PBKDF2\u0027"
],
"packageName": "danielberkompas/cloak_ecto",
"packageURL": "pkg:github/danielberkompas/cloak_ecto",
"product": "cloak_ecto",
"programFiles": [
"lib/cloak_ecto/types/pbkdf2.ex"
],
"repo": "https://github.com/danielberkompas/cloak_ecto",
"vendor": "danielberkompas",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "a8fa1642b02f1c445a1ee8794c9095eb0921f8f3",
"versionType": "git"
}
]
},
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Cloak.Fields.PBKDF2\u0027"
],
"packageName": "cloak",
"packageURL": "pkg:hex/cloak",
"product": "cloak",
"programFiles": [
"lib/cloak/fields/pbkdf2.ex"
],
"repo": "https://github.com/danielberkompas/cloak",
"vendor": "danielberkompas",
"versions": [
{
"lessThan": "1.0.0-alpha.0",
"status": "affected",
"version": "0.7.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Cloak.Fields.PBKDF2\u0027"
],
"packageName": "danielberkompas/cloak",
"packageURL": "pkg:github/danielberkompas/cloak",
"product": "cloak",
"programFiles": [
"lib/cloak/fields/pbkdf2.ex"
],
"repo": "https://github.com/danielberkompas/cloak",
"vendor": "danielberkompas",
"versions": [
{
"lessThan": "681c9702b7cd9afe0e5a840751ab009f550c69a9",
"status": "affected",
"version": "8699e6417a162c39d9f0ef63511bd23d3f38d1d2",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:danielberkompas:cloak_ecto:*:*:*:*:*:*:*:*",
"versionStartIncluding": "1.0.0-alpha.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.0.0-alpha.0",
"versionStartIncluding": "0.7.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "reporter",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "coordinator",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"dateAssigned": "2026-10-06T08:35:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eUse of Password Hash With Insufficient Computational Effort vulnerability in danielberkompas cloak_ecto and danielberkompas cloak allows an attacker who holds the hashed values and the configured secret to brute-force low-entropy plaintexts much faster than configured.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode\u003edump/1\u003c/code\u003e callback that \u003ccode\u003eCloak.Ecto.PBKDF2\u003c/code\u003e (\u003ccode\u003eCloak.Fields.PBKDF2\u003c/code\u003e in cloak before the Ecto code moved to cloak_ecto) injects into a field module calls \u003ccode\u003e:pbkdf2.pbkdf2/4\u003c/code\u003e with \u003ccode\u003econfig[:size]\u003c/code\u003e in the iteration-count position. The \u003ccode\u003e:iterations\u003c/code\u003e setting is validated but never used. With the cloak_ecto defaults (\u003ccode\u003eiterations: 600_000\u003c/code\u003e, \u003ccode\u003esize: 32\u003c/code\u003e) each hash runs 32 PBKDF2 rounds instead of 600,000, so offline guessing of values such as email addresses costs about 18,750 times less than configured.\u003c/p\u003e\n\u003cp\u003eThis issue affects cloak_ecto: from 1.0.0-alpha.0 onward; cloak: from 0.7.0 before 1.0.0-alpha.0.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Use of Password Hash With Insufficient Computational Effort vulnerability in danielberkompas cloak_ecto and danielberkompas cloak allows an attacker who holds the hashed values and the configured secret to brute-force low-entropy plaintexts much faster than configured.\n\nThe `dump/1` callback that `Cloak.Ecto.PBKDF2` (`Cloak.Fields.PBKDF2` in cloak before the Ecto code moved to cloak_ecto) injects into a field module calls `:pbkdf2.pbkdf2/4` with `config[:size]` in the iteration-count position. The `:iterations` setting is validated but never used. With the cloak_ecto defaults (`iterations: 600_000`, `size: 32`) each hash runs 32 PBKDF2 rounds instead of 600,000, so offline guessing of values such as email addresses costs about 18,750 times less than configured.\n\nThis issue affects cloak_ecto: from 1.0.0-alpha.0 onward; cloak: from 0.7.0 before 1.0.0-alpha.0."
}
],
"value": "Use of Password Hash With Insufficient Computational Effort vulnerability in danielberkompas cloak_ecto and danielberkompas cloak allows an attacker who holds the hashed values and the configured secret to brute-force low-entropy plaintexts much faster than configured.\n\nThe dump/1 callback that Cloak.Ecto.PBKDF2 (Cloak.Fields.PBKDF2 in cloak before the Ecto code moved to cloak_ecto) injects into a field module calls :pbkdf2.pbkdf2/4 with config[:size] in the iteration-count position. The :iterations setting is validated but never used. With the cloak_ecto defaults (iterations: 600_000, size: 32) each hash runs 32 PBKDF2 rounds instead of 600,000, so offline guessing of values such as email addresses costs about 18,750 times less than configured.\n\nThis issue affects cloak_ecto: from 1.0.0-alpha.0 onward; cloak: from 0.7.0 before 1.0.0-alpha.0."
}
],
"impacts": [
{
"capecId": "CAPEC-55",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn attacker who obtains a database dump and the PBKDF2 secret can recover hashed values with low entropy, such as email addresses, by offline guessing at a cost far below what the configuration promises.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "An attacker who obtains a database dump and the PBKDF2 secret can recover hashed values with low entropy, such as email addresses, by offline guessing at a cost far below what the configuration promises."
}
],
"value": "An attacker who obtains a database dump and the PBKDF2 secret can recover hashed values with low entropy, such as email addresses, by offline guessing at a cost far below what the configuration promises."
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-916",
"description": "CWE-916 Use of Password Hash With Insufficient Computational Effort",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-06T08:38:04.584Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"name": "EEF CNA record for CVE-2026-94206",
"tags": [
"related",
"third-party-advisory"
],
"url": "https://cna.erlef.org/cves/CVE-2026-94206.html"
},
{
"name": "OSV record EEF-CVE-2026-94206",
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-94206"
},
{
"name": "Introducing commit a8fa164 in danielberkompas/cloak_ecto",
"tags": [
"related"
],
"url": "https://github.com/danielberkompas/cloak_ecto/commit/a8fa1642b02f1c445a1ee8794c9095eb0921f8f3"
},
{
"name": "Introducing commit 8699e64 in danielberkompas/cloak",
"tags": [
"related"
],
"url": "https://github.com/danielberkompas/cloak/commit/8699e6417a162c39d9f0ef63511bd23d3f38d1d2"
},
{
"name": "Fix commit 681c970 in danielberkompas/cloak",
"tags": [
"patch"
],
"url": "https://github.com/danielberkompas/cloak/commit/681c9702b7cd9afe0e5a840751ab009f550c69a9"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Cloak PBKDF2 field ignores the configured iteration count and runs only :size rounds",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eOverride \u003ccode\u003edump/1\u003c/code\u003e in the field module that uses \u003ccode\u003eCloak.Ecto.PBKDF2\u003c/code\u003e, so that it calls \u003ccode\u003e:pbkdf2.pbkdf2/5\u003c/code\u003e with the configured \u003ccode\u003e:iterations\u003c/code\u003e and \u003ccode\u003e:size\u003c/code\u003e. Then recompute all stored hashes, because the existing values no longer match.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Override `dump/1` in the field module that uses `Cloak.Ecto.PBKDF2`, so that it calls `:pbkdf2.pbkdf2/5` with the configured `:iterations` and `:size`. Then recompute all stored hashes, because the existing values no longer match."
}
],
"value": "Override dump/1 in the field module that uses Cloak.Ecto.PBKDF2, so that it calls :pbkdf2.pbkdf2/5 with the configured :iterations and :size. Then recompute all stored hashes, because the existing values no longer match."
}
],
"x_proofOfConcept": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003col\u003e\n\u003cli\u003eDefine a field module with \u003ccode\u003euse Cloak.Ecto.PBKDF2\u003c/code\u003e and configure only a \u003ccode\u003e:secret\u003c/code\u003e, so that the defaults \u003ccode\u003eiterations: 600_000\u003c/code\u003e and \u003ccode\u003esize: 32\u003c/code\u003e apply.\u003c/li\u003e\n\u003cli\u003eCall \u003ccode\u003edump/1\u003c/code\u003e on a value.\u003c/li\u003e\n\u003cli\u003eCompare the result with \u003ccode\u003e:pbkdf2.pbkdf2({:hmac, :sha256}, value, secret, 32)\u003c/code\u003e and with the same call at 600,000 rounds. It matches the 32-round hash, not the 600,000-round hash, and returns in microseconds instead of about one second.\u003c/li\u003e\n\u003c/ol\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "1. Define a field module with `use Cloak.Ecto.PBKDF2` and configure only a `:secret`, so that the defaults `iterations: 600_000` and `size: 32` apply.\n2. Call `dump/1` on a value.\n3. Compare the result with `:pbkdf2.pbkdf2({:hmac, :sha256}, value, secret, 32)` and with the same call at 600,000 rounds. It matches the 32-round hash, not the 600,000-round hash, and returns in microseconds instead of about one second."
}
],
"value": "* Define a field module with use Cloak.Ecto.PBKDF2 and configure only a :secret, so that the defaults iterations: 600_000 and size: 32 apply.\n* Call dump/1 on a value.\n* Compare the result with :pbkdf2.pbkdf2({:hmac, :sha256}, value, secret, 32) and with the same call at 600,000 rounds. It matches the 32-round hash, not the 600,000-round hash, and returns in microseconds instead of about one second."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-94206",
"datePublished": "2026-10-06T08:38:04.584Z",
"dateReserved": "2026-09-24T09:30:02.102Z",
"dateUpdated": "2026-10-06T11:36:25.466Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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.
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