{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-95105", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-09-25T07:00:01.880Z", "datePublished": "2026-10-06T08:37:56.987Z", "dateUpdated": "2026-10-06T11:40:42.775Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Cloak.Ciphers.AES.CTR'", "'Elixir.Cloak.Ciphers.Deprecated.AES.CTR'"], "packageName": "cloak", "packageURL": "pkg:hex/cloak", "product": "cloak", "programFiles": ["lib/cloak/ciphers/aes_ctr.ex", "lib/cloak/ciphers/deprecated/aes_ctr.ex"], "programRoutines": [{"name": "'Elixir.Cloak.Ciphers.AES.CTR':encrypt/2"}, {"name": "'Elixir.Cloak.Ciphers.AES.CTR':decrypt/2"}, {"name": "'Elixir.Cloak.Ciphers.Deprecated.AES.CTR':decrypt/2"}], "repo": "https://github.com/danielberkompas/cloak", "vendor": "danielberkompas", "versions": [{"lessThan": "*", "status": "affected", "version": "0.1.0-pre", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Cloak.Ciphers.AES.CTR'", "'Elixir.Cloak.Ciphers.Deprecated.AES.CTR'"], "packageName": "danielberkompas/cloak", "packageURL": "pkg:github/danielberkompas/cloak", "product": "cloak", "programFiles": ["lib/cloak/ciphers/aes_ctr.ex", "lib/cloak/ciphers/deprecated/aes_ctr.ex"], "programRoutines": [{"name": "'Elixir.Cloak.Ciphers.AES.CTR':encrypt/2"}, {"name": "'Elixir.Cloak.Ciphers.AES.CTR':decrypt/2"}, {"name": "'Elixir.Cloak.Ciphers.Deprecated.AES.CTR':decrypt/2"}], "repo": "https://github.com/danielberkompas/cloak", "vendor": "danielberkompas", "versions": [{"lessThan": "*", "status": "affected", "version": "2bd17019e285b55c5c218cc842537bf9280f24c3", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.1.0-pre", "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": "2026-10-06T08:37:34.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping.</p>\n<p><code>Cloak.Ciphers.AES.CTR</code> encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. <code>decrypt/2</code> checks only the key tag and the minimum length before it returns the plaintext, and <code>Cloak.Ciphers.Deprecated.AES.CTR</code> decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error.</p>\n<p>This issue affects cloak: from 0.1.0-pre onward.</p>"}, {"base64": false, "type": "text/markdown", "value": "Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping.\n\n`Cloak.Ciphers.AES.CTR` encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. `decrypt/2` checks only the key tag and the minimum length before it returns the plaintext, and `Cloak.Ciphers.Deprecated.AES.CTR` decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error.\n\nThis issue affects cloak: from 0.1.0-pre onward."}], "value": "Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping.\n\nCloak.Ciphers.AES.CTR encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. decrypt/2 checks only the key tag and the minimum length before it returns the plaintext, and Cloak.Ciphers.Deprecated.AES.CTR decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error.\n\nThis issue affects cloak: from 0.1.0-pre onward."}], "impacts": [{"capecId": "CAPEC-39", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>An attacker who can write to the encrypted store can set encrypted fields with known or guessable contents, such as roles, flags, or fixed-format records, to values of their choice without the key. The application decrypts and trusts the forged value.</p>"}, {"base64": false, "type": "text/markdown", "value": "An attacker who can write to the encrypted store can set encrypted fields with known or guessable contents, such as roles, flags, or fixed-format records, to values of their choice without the key. The application decrypts and trusts the forged value."}], "value": "An attacker who can write to the encrypted store can set encrypted fields with known or guessable contents, such as roles, flags, or fixed-format records, to values of their choice without the key. The application decrypts and trusts the forged value."}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 8.2, "baseSeverity": "HIGH", "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:N/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-649", "description": "CWE-649 Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-10-06T08:37:56.987Z"}, "references": [{"name": "EEF CNA record for CVE-2026-95105", "tags": ["related", "third-party-advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-95105.html"}, {"name": "OSV record EEF-CVE-2026-95105", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-95105"}, {"name": "Introducing commit 2bd1701 in danielberkompas/cloak", "tags": ["related"], "url": "https://github.com/danielberkompas/cloak/commit/2bd17019e285b55c5c218cc842537bf9280f24c3"}], "source": {"discovery": "EXTERNAL"}, "title": "Cloak AES-CTR cipher lacks ciphertext authentication, allowing chosen-plaintext forgery by bit flipping", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Configure the vault with <code>Cloak.Ciphers.AES.GCM</code> as the default cipher and re-encrypt existing values, for example with the <code>cloak.migrate.ecto</code> task from cloak_ecto. Then remove <code>Cloak.Ciphers.AES.CTR</code> and <code>Cloak.Ciphers.Deprecated.AES.CTR</code> from the vault configuration, so that ciphertext in the CTR format is no longer decrypted. AES-GCM authenticates the ciphertext and rejects modified values.</p>"}, {"base64": false, "type": "text/markdown", "value": "Configure the vault with `Cloak.Ciphers.AES.GCM` as the default cipher and re-encrypt existing values, for example with the `cloak.migrate.ecto` task from cloak_ecto. Then remove `Cloak.Ciphers.AES.CTR` and `Cloak.Ciphers.Deprecated.AES.CTR` from the vault configuration, so that ciphertext in the CTR format is no longer decrypted. AES-GCM authenticates the ciphertext and rejects modified values."}], "value": "Configure the vault with Cloak.Ciphers.AES.GCM as the default cipher and re-encrypt existing values, for example with the cloak.migrate.ecto task from cloak_ecto. Then remove Cloak.Ciphers.AES.CTR and Cloak.Ciphers.Deprecated.AES.CTR from the vault configuration, so that ciphertext in the CTR format is no longer decrypted. AES-GCM authenticates the ciphertext and rejects modified values."}], "x_proofOfConcept": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<ol>\n<li>Encrypt <code>\"role=user \"</code> with <code>Cloak.Ciphers.AES.CTR.encrypt/2</code> and a random 32-byte key.</li>\n<li>Without the key, XOR the last 10 bytes of the result (the ciphertext body) with <code>:crypto.exor(\"role=user \", \"role=admin\")</code>. Leave the key tag and the IV unchanged.</li>\n<li>Call <code>Cloak.Ciphers.AES.CTR.decrypt/2</code> on the modified value. It returns <code>{:ok, \"role=admin\"}</code>.</li>\n</ol>"}, {"base64": false, "type": "text/markdown", "value": "1. Encrypt `\"role=user \"` with `Cloak.Ciphers.AES.CTR.encrypt/2` and a random 32-byte key.\n2. Without the key, XOR the last 10 bytes of the result (the ciphertext body) with `:crypto.exor(\"role=user \", \"role=admin\")`. Leave the key tag and the IV unchanged.\n3. Call `Cloak.Ciphers.AES.CTR.decrypt/2` on the modified value. It returns `{:ok, \"role=admin\"}`."}], "value": "* Encrypt \"role=user \" with Cloak.Ciphers.AES.CTR.encrypt/2 and a random 32-byte key.\n* Without the key, XOR the last 10 bytes of the result (the ciphertext body) with :crypto.exor(\"role=user \", \"role=admin\"). Leave the key tag and the IV unchanged.\n* Call Cloak.Ciphers.AES.CTR.decrypt/2 on the modified value. It returns {:ok, \"role=admin\"}."}]}, "adp": [{"references": [{"url": "https://cna.erlef.org/cves/CVE-2026-95105.html", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-06T11:37:58.212117Z", "id": "CVE-2026-95105", "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": "2026-10-06T11:40:42.775Z"}}]}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Cloak.Ciphers.AES.CTR'", "'Elixir.Cloak.Ciphers.Deprecated.AES.CTR'"], "packageName": "cloak", "packageURL": "pkg:hex/cloak", "product": "cloak", "programFiles": ["lib/cloak/ciphers/aes_ctr.ex", "lib/cloak/ciphers/deprecated/aes_ctr.ex"], "programRoutines": [{"name": "'Elixir.Cloak.Ciphers.AES.CTR':encrypt/2"}, {"name": "'Elixir.Cloak.Ciphers.AES.CTR':decrypt/2"}, {"name": "'Elixir.Cloak.Ciphers.Deprecated.AES.CTR':decrypt/2"}], "repo": "https://github.com/danielberkompas/cloak", "vendor": "danielberkompas", "versions": [{"lessThan": "*", "status": "affected", "version": "0.1.0-pre", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Cloak.Ciphers.AES.CTR'", "'Elixir.Cloak.Ciphers.Deprecated.AES.CTR'"], "packageName": "danielberkompas/cloak", "packageURL": "pkg:github/danielberkompas/cloak", "product": "cloak", "programFiles": ["lib/cloak/ciphers/aes_ctr.ex", "lib/cloak/ciphers/deprecated/aes_ctr.ex"], "programRoutines": [{"name": "'Elixir.Cloak.Ciphers.AES.CTR':encrypt/2"}, {"name": "'Elixir.Cloak.Ciphers.AES.CTR':decrypt/2"}, {"name": "'Elixir.Cloak.Ciphers.Deprecated.AES.CTR':decrypt/2"}], "repo": "https://github.com/danielberkompas/cloak", "vendor": "danielberkompas", "versions": [{"lessThan": "*", "status": "affected", "version": "2bd17019e285b55c5c218cc842537bf9280f24c3", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping.\n\nCloak.Ciphers.AES.CTR encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. decrypt/2 checks only the key tag and the minimum length before it returns the plaintext, and Cloak.Ciphers.Deprecated.AES.CTR decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error.\n\nThis issue affects cloak: from 0.1.0-pre onward."}], "id": "CVE-2026-95105", "lastModified": "2026-10-06T09:17:57.200", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "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:N/VI:H/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": "NONE", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}, "published": "2026-10-06T09:17:57.200", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-95105.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/danielberkompas/cloak/commit/2bd17019e285b55c5c218cc842537bf9280f24c3"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-95105"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-649"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{}