CVE-2026-81319 (GCVE-0-2026-81319)
Vulnerability from cvelistv5 – Published: 2026-08-30 18:05 – Updated: 2026-08-30 18:05
VLAI
EPSS
VEX
Title
Unsafe deserialization of decrypted terms enables node DoS in AshCloak
Summary
Deserialization of Untrusted Data vulnerability in ash-project ash_cloak allows an attacker who can influence the bytes of an encrypted column to crash the BEAM node, by triggering unbounded atom creation or a decompression bomb during decryption.
AshCloak.Calculations.Decrypt decodes the decrypted binary with Ash.Helpers.non_executable_binary_to_term/1 without the :safe option, so atoms in the payload are interned during the decode and never garbage collected, and the term format's compressed form is inflated transparently. vault.decrypt!() is the only barrier and stops tampering only for an authenticated cipher. Cloak also ships the unauthenticated AES.CTR, whose ciphertext an attacker who knows their own plaintext can XOR into any same-length payload without the key, so an ordinary read of the forged column reaches the decoder. A few hundred kilobytes of distinct atoms exhausts the atom table, or a small compressed payload inflates to gigabytes.
This issue affects ash_cloak: from 0.1.0 before 0.4.0.
Severity
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash_cloak/security… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-81319.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-81319 | related |
| https://github.com/ash-project/ash_cloak/commit/1… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| ash-project | ash_cloak |
Affected:
0.1.0 , < 0.4.0
(semver)
cpe:2.3:a:ash-project:ash_cloak:*:*:*:*:*:*:*:* |
||
| ash-project | ash_cloak |
Affected:
f1595a77fdfa9bfc672f84c2f77feb9e7bf895fc , < 1690f0a436efe3e7c11d70d74ff5a8ac0fdf6608
(git)
cpe:2.3:a:ash-project:ash_cloak:*:*:*:*:*:*:*:* |
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:ash-project:ash_cloak:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.AshCloak.Calculations.Decrypt\u0027"
],
"packageName": "ash_cloak",
"packageURL": "pkg:hex/ash_cloak",
"product": "ash_cloak",
"programFiles": [
"lib/ash_cloak/calculations/decrypt.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.AshCloak.Calculations.Decrypt\u0027:calculate/3"
}
],
"repo": "https://github.com/ash-project/ash_cloak",
"vendor": "ash-project",
"versions": [
{
"lessThan": "0.4.0",
"status": "affected",
"version": "0.1.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:ash-project:ash_cloak:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.AshCloak.Calculations.Decrypt\u0027"
],
"packageName": "ash-project/ash_cloak",
"packageURL": "pkg:github/ash-project/ash_cloak",
"product": "ash_cloak",
"programFiles": [
"lib/ash_cloak/calculations/decrypt.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.AshCloak.Calculations.Decrypt\u0027:calculate/3"
}
],
"repo": "https://github.com/ash-project/ash_cloak",
"vendor": "ash-project",
"versions": [
{
"lessThan": "1690f0a436efe3e7c11d70d74ff5a8ac0fdf6608",
"status": "affected",
"version": "f1595a77fdfa9bfc672f84c2f77feb9e7bf895fc",
"versionType": "git"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn application must use ash_cloak with an unauthenticated vault cipher (for example the \u003ccode\u003eAES.CTR\u003c/code\u003e cipher shipped by Cloak), or run in a deployment where the stored ciphertext can be modified, and read a cloaked field so the decrypt calculation runs.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "An application must use ash_cloak with an unauthenticated vault cipher (for example the `AES.CTR` cipher shipped by Cloak), or run in a deployment where the stored ciphertext can be modified, and read a cloaked field so the decrypt calculation runs."
}
],
"value": "An application must use ash_cloak with an unauthenticated vault cipher (for example the AES.CTR cipher shipped by Cloak), or run in a deployment where the stored ciphertext can be modified, and read a cloaked field so the decrypt calculation runs."
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:ash-project:ash_cloak:*:*:*:*:*:*:*:*",
"versionEndExcluding": "0.4.0",
"versionStartIncluding": "0.1.0",
"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": "remediation developer",
"value": "Zach Daniel / Ash Project"
},
{
"lang": "en",
"type": "coordinator",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eDeserialization of Untrusted Data vulnerability in ash-project ash_cloak allows an attacker who can influence the bytes of an encrypted column to crash the BEAM node, by triggering unbounded atom creation or a decompression bomb during decryption.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eAshCloak.Calculations.Decrypt\u003c/code\u003e decodes the decrypted binary with \u003ccode\u003eAsh.Helpers.non_executable_binary_to_term/1\u003c/code\u003e without the \u003ccode\u003e:safe\u003c/code\u003e option, so atoms in the payload are interned during the decode and never garbage collected, and the term format\u0027s compressed form is inflated transparently. \u003ccode\u003evault.decrypt!()\u003c/code\u003e is the only barrier and stops tampering only for an authenticated cipher. Cloak also ships the unauthenticated \u003ccode\u003eAES.CTR\u003c/code\u003e, whose ciphertext an attacker who knows their own plaintext can XOR into any same-length payload without the key, so an ordinary read of the forged column reaches the decoder. A few hundred kilobytes of distinct atoms exhausts the atom table, or a small compressed payload inflates to gigabytes.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_cloak: from 0.1.0 before 0.4.0.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Deserialization of Untrusted Data vulnerability in ash-project ash_cloak allows an attacker who can influence the bytes of an encrypted column to crash the BEAM node, by triggering unbounded atom creation or a decompression bomb during decryption.\n\n`AshCloak.Calculations.Decrypt` decodes the decrypted binary with `Ash.Helpers.non_executable_binary_to_term/1` without the `:safe` option, so atoms in the payload are interned during the decode and never garbage collected, and the term format\u0027s compressed form is inflated transparently. `vault.decrypt!()` is the only barrier and stops tampering only for an authenticated cipher. Cloak also ships the unauthenticated `AES.CTR`, whose ciphertext an attacker who knows their own plaintext can XOR into any same-length payload without the key, so an ordinary read of the forged column reaches the decoder. A few hundred kilobytes of distinct atoms exhausts the atom table, or a small compressed payload inflates to gigabytes.\n\nThis issue affects ash_cloak: from 0.1.0 before 0.4.0."
}
],
"value": "Deserialization of Untrusted Data vulnerability in ash-project ash_cloak allows an attacker who can influence the bytes of an encrypted column to crash the BEAM node, by triggering unbounded atom creation or a decompression bomb during decryption.\n\nAshCloak.Calculations.Decrypt decodes the decrypted binary with Ash.Helpers.non_executable_binary_to_term/1 without the :safe option, so atoms in the payload are interned during the decode and never garbage collected, and the term format\u0027s compressed form is inflated transparently. vault.decrypt!() is the only barrier and stops tampering only for an authenticated cipher. Cloak also ships the unauthenticated AES.CTR, whose ciphertext an attacker who knows their own plaintext can XOR into any same-length payload without the key, so an ordinary read of the forged column reaches the decoder. A few hundred kilobytes of distinct atoms exhausts the atom table, or a small compressed payload inflates to gigabytes.\n\nThis issue affects ash_cloak: from 0.1.0 before 0.4.0."
}
],
"impacts": [
{
"capecId": "CAPEC-586",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-586 Object Injection"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-502",
"description": "CWE-502 Deserialization of Untrusted Data",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-30T18:05:13.889Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/ash-project/ash_cloak/security/advisories/GHSA-rc26-mrm2-6pf9"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-81319.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-81319"
},
{
"tags": [
"patch"
],
"url": "https://github.com/ash-project/ash_cloak/commit/1690f0a436efe3e7c11d70d74ff5a8ac0fdf6608"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Unsafe deserialization of decrypted terms enables node DoS in AshCloak"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-81319",
"datePublished": "2026-08-30T18:05:13.889Z",
"dateReserved": "2026-08-30T05:45:01.821Z",
"dateUpdated": "2026-08-30T18:05:13.889Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-81319\",\"sourceIdentifier\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"published\":\"2026-08-30T18:16:59.157\",\"lastModified\":\"2026-08-30T18:16:59.157\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Deserialization of Untrusted Data vulnerability in ash-project ash_cloak allows an attacker who can influence the bytes of an encrypted column to crash the BEAM node, by triggering unbounded atom creation or a decompression bomb during decryption.\\n\\nAshCloak.Calculations.Decrypt decodes the decrypted binary with Ash.Helpers.non_executable_binary_to_term/1 without the :safe option, so atoms in the payload are interned during the decode and never garbage collected, and the term format\u0027s compressed form is inflated transparently. vault.decrypt!() is the only barrier and stops tampering only for an authenticated cipher. Cloak also ships the unauthenticated AES.CTR, whose ciphertext an attacker who knows their own plaintext can XOR into any same-length payload without the key, so an ordinary read of the forged column reaches the decoder. 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}
}
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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.
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.
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