CVE-2026-94206 (GCVE-0-2026-94206)
Vulnerability from cvelistv5
Published
2026-10-06 08:38
Modified
2026-10-06 11:36
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-916 - Use of Password Hash With Insufficient Computational Effort
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.
References
Impacted products
| Vendor | Product | Version | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| danielberkompas | cloak_ecto |
Version: 1.0.0-alpha.0 ≤ cpe:2.3:a:danielberkompas:cloak_ecto:*:*:*:*:*:*:*:* |
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|
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\"pkg:github/danielberkompas/cloak\", \"packageName\": \"danielberkompas/cloak\", \"programFiles\": [\"lib/cloak/fields/pbkdf2.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://cna.erlef.org/cves/CVE-2026-94206.html\", \"name\": \"EEF CNA record for CVE-2026-94206\", \"tags\": [\"related\", \"third-party-advisory\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-94206\", \"name\": \"OSV record EEF-CVE-2026-94206\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/danielberkompas/cloak_ecto/commit/a8fa1642b02f1c445a1ee8794c9095eb0921f8f3\", \"name\": \"Introducing commit a8fa164 in danielberkompas/cloak_ecto\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/danielberkompas/cloak/commit/8699e6417a162c39d9f0ef63511bd23d3f38d1d2\", \"name\": \"Introducing commit 8699e64 in danielberkompas/cloak\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/danielberkompas/cloak/commit/681c9702b7cd9afe0e5a840751ab009f550c69a9\", \"name\": \"Fix commit 681c970 in danielberkompas/cloak\", \"tags\": [\"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"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.\", \"base64\": false}]}], \"dateAssigned\": \"2026-10-06T08:35:00.000Z\", \"descriptions\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-916\", \"description\": \"CWE-916 Use of Password Hash With Insufficient Computational Effort\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:danielberkompas:cloak_ecto:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"1.0.0-alpha.0\"}, {\"criteria\": \"cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.0.0-alpha.0\", \"versionStartIncluding\": \"0.7.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-10-06T08:38:04.584Z\"}, \"x_proofOfConcept\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"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.\", \"base64\": false}]}]}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-94206\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-06T11:36:25.466Z\", \"dateReserved\": \"2026-09-24T09:30:02.102Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-10-06T08:38:04.584Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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