CVE-2026-95105 (GCVE-0-2026-95105)
Vulnerability from cvelistv5 – Published: 2026-10-06 08:37 – Updated: 2026-10-06 11:40
VLAI
EPSS
VEX
Title
Cloak AES-CTR cipher lacks ciphertext authentication, allowing chosen-plaintext forgery by bit flipping
Summary
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.
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.
This issue affects cloak: from 0.1.0-pre onward.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 11:37 UTC
CWE
- CWE-649 - Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cna.erlef.org/cves/CVE-2026-95105.html | relatedthird-party-advisory |
| https://osv.dev/vulnerability/EEF-CVE-2026-95105 | related |
| https://github.com/danielberkompas/cloak/commit/2… | related |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| danielberkompas | cloak |
Affected:
0.1.0-pre , < *
(semver)
cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:* |
||
| danielberkompas | cloak |
Affected:
2bd17019e285b55c5c218cc842537bf9280f24c3 , < *
(git)
cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:* |
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},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://cna.erlef.org/cves/CVE-2026-95105.html"
}
],
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-649"
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-95105",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-06T11:37:58.212117Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-06T11:40:24.528Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://cna.erlef.org/cves/CVE-2026-95105.html"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Cloak.Ciphers.AES.CTR\u0027",
"\u0027Elixir.Cloak.Ciphers.Deprecated.AES.CTR\u0027"
],
"packageName": "cloak",
"packageURL": "pkg:hex/cloak",
"product": "cloak",
"programFiles": [
"lib/cloak/ciphers/aes_ctr.ex",
"lib/cloak/ciphers/deprecated/aes_ctr.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Cloak.Ciphers.AES.CTR\u0027:encrypt/2"
},
{
"name": "\u0027Elixir.Cloak.Ciphers.AES.CTR\u0027:decrypt/2"
},
{
"name": "\u0027Elixir.Cloak.Ciphers.Deprecated.AES.CTR\u0027: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": [
"\u0027Elixir.Cloak.Ciphers.AES.CTR\u0027",
"\u0027Elixir.Cloak.Ciphers.Deprecated.AES.CTR\u0027"
],
"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": "\u0027Elixir.Cloak.Ciphers.AES.CTR\u0027:encrypt/2"
},
{
"name": "\u0027Elixir.Cloak.Ciphers.AES.CTR\u0027:decrypt/2"
},
{
"name": "\u0027Elixir.Cloak.Ciphers.Deprecated.AES.CTR\u0027: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": "\u003cp\u003eReliance 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.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eCloak.Ciphers.AES.CTR\u003c/code\u003e encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. \u003ccode\u003edecrypt/2\u003c/code\u003e checks only the key tag and the minimum length before it returns the plaintext, and \u003ccode\u003eCloak.Ciphers.Deprecated.AES.CTR\u003c/code\u003e 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.\u003c/p\u003e\n\u003cp\u003eThis issue affects cloak: from 0.1.0-pre onward.\u003c/p\u003e"
},
{
"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": "\u003cp\u003eAn 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.\u003c/p\u003e"
},
{
"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": {
"dateUpdated": "2026-10-06T08:37:56.987Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"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": "\u003cp\u003eConfigure the vault with \u003ccode\u003eCloak.Ciphers.AES.GCM\u003c/code\u003e as the default cipher and re-encrypt existing values, for example with the \u003ccode\u003ecloak.migrate.ecto\u003c/code\u003e task from cloak_ecto. Then remove \u003ccode\u003eCloak.Ciphers.AES.CTR\u003c/code\u003e and \u003ccode\u003eCloak.Ciphers.Deprecated.AES.CTR\u003c/code\u003e from the vault configuration, so that ciphertext in the CTR format is no longer decrypted. AES-GCM authenticates the ciphertext and rejects modified values.\u003c/p\u003e"
},
{
"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": "\u003col\u003e\n\u003cli\u003eEncrypt \u003ccode\u003e\"role=user \"\u003c/code\u003e with \u003ccode\u003eCloak.Ciphers.AES.CTR.encrypt/2\u003c/code\u003e and a random 32-byte key.\u003c/li\u003e\n\u003cli\u003eWithout the key, XOR the last 10 bytes of the result (the ciphertext body) with \u003ccode\u003e:crypto.exor(\"role=user \", \"role=admin\")\u003c/code\u003e. Leave the key tag and the IV unchanged.\u003c/li\u003e\n\u003cli\u003eCall \u003ccode\u003eCloak.Ciphers.AES.CTR.decrypt/2\u003c/code\u003e on the modified value. It returns \u003ccode\u003e{:ok, \"role=admin\"}\u003c/code\u003e.\u003c/li\u003e\n\u003c/ol\u003e"
},
{
"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\"}."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-95105",
"datePublished": "2026-10-06T08:37:56.987Z",
"dateReserved": "2026-09-25T07:00:01.880Z",
"dateUpdated": "2026-10-06T11:40:42.775Z",
"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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