{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-94206", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-09-24T09:30:02.102Z", "datePublished": "2026-10-06T08:38:04.584Z", "dateUpdated": "2026-10-06T11:36:25.466Z" }, "containers": { "cna": { "affected": [ { "collectionURL": "https://repo.hex.pm", "cpes": [ "cpe:2.3:a:danielberkompas:cloak_ecto:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "'Elixir.Cloak.Ecto.PBKDF2'" ], "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": [ "'Elixir.Cloak.Ecto.PBKDF2'" ], "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": [ "'Elixir.Cloak.Fields.PBKDF2'" ], "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": [ "'Elixir.Cloak.Fields.PBKDF2'" ], "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 Männchen / EEF" } ], "dateAssigned": "2026-10-06T08:35:00.000Z", "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "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

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.

\n

This issue affects cloak_ecto: from 1.0.0-alpha.0 onward; cloak: from 0.7.0 before 1.0.0-alpha.0.

" }, { "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": "

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.

" }, { "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": { "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-10-06T08:38:04.584Z" }, "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": "

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, "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": "
    \n
  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.
    2. \n
  2. Call dump/1 on a value.
    3. \n
  3. 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.
    4. \n
" }, { "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." } ] }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-10-06T11:34:00.942993Z", "id": "CVE-2026-94206", "options": [ { "Exploitation": "poc" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-06T11:36:25.466Z" } } ] } }