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CVE-2026-81319— Unsafe deserialization of decrypted terms enables node DoS in AshCloak

Quick assessment

Affected
ash-project ash_cloak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ash-project 的 ash_cloak 存在“不可信数据反序列化漏洞”。能够影响加密列字节的攻击者可以通过在解密过程中触发无限制的原子（atom）创建或“解压缩炸弹（decompression bomb）”，从而导致 BEAM 节点崩溃。 具体技术细节如下： 1. 解码过程存在风险： 在解码解密后的二进制数据时，调用 时未使用 选项。这导致负载中的原子（atoms）在解码时被永久驻留（interned），无法被垃圾回收；同时，term 格式的压缩形式会在解码过程中被透明地解压膨胀。 2. 认证机制的局限性：

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-81319

Vulnerability Information
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Vulnerability Title
Unsafe deserialization of decrypted terms enables node DoS in AshCloak
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash_cloak 0.1.0 ~ 0.4.0 cpe:2.3:a:ash-project:ash_cloak:*:*:*:*:*:*:*:*
ash-project ash_cloak f1595a77fdfa9bfc672f84c2f77feb9e7bf895fc ~ 1690f0a436efe3e7c11d70d74ff5a8ac0fdf6608 cpe:2.3:a:ash-project:ash_cloak:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-81319

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III. Intelligence Information for CVE-2026-81319

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Other References for CVE-2026-81319 (4)

Same Patch Batch · ash-project · 2026-08-30 · 14 CVEs total

CVE-2026-78699 7.2 HIGH rename_tenant returns :ok on a failed rename, enabling cross-tenant access in AshPostgres
CVE-2026-75847 5.9 MEDIUM Sensitive attribute values stored in a non-sensitive public changes map in AshPaperTrail
CVE-2026-77970 5.9 MEDIUM Sensitive fields nested in embedded values are not redacted in AshPaperTrail versions
CVE-2026-78038 5.9 MEDIUM Job argument injection via :args overrides primary_key and tenant in AshOban
CVE-2026-78228 5.9 MEDIUM Unbounded handle_error recursion enables denial of service in AshOban triggers
CVE-2026-77454 5.9 MEDIUM exists/2 predicate silently dropped on limited relationships with a parent() filter in Ash
CVE-2026-77831 2.1 LOW Algorithmic-complexity denial of service in AshPaperTrail full-diff list tracking
CVE-2026-77846 2.1 LOW JSON path injection via unescaped get_path segments in AshSqlite
CVE-2026-81318 2.1 LOW Distinct-query aggregate drops the tenant schema prefix, leaking across tenants in AshSql
CVE-2026-78691 2.1 LOW Unescaped backslash allows LIKE wildcard injection in AshSql string search
CVE-2026-80227 2.1 LOW SQL string_trim removes only spaces, diverging from in-memory trimming in AshSql
CVE-2026-81316 2.1 LOW Same-named aggregates with differing filters are conflated in AshSql
CVE-2026-81322 2.1 LOW Cloaked plaintext leaks through a non-sensitive action argument in AshCloak

IV. Related Vulnerabilities

Same product: ash_cloak
Same vendor: ash-project
Same weakness: CWE-502

V. Comments for CVE-2026-81319

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