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CVE-2026-82738— Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of service

Quick assessment

Affected
ash-project ash
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 项目中 ash 存在输入验证不当漏洞，攻击者可以通过在 属性中存储一个非第7版（non-version-7）的 UUID，从而持续地阻止对该记录进行读取。 能够接受任何格式正确的 UUID 字符串（包括非第7版的 UUID），并将其存储为 16 字节的二进制数据。在读取时， （位于 ）会将已存储的二进制数据重新通过 处理。由于从 v3.6.3 开始的输入验证强化，该函数仅匹配第7版（以及可选的第4版）的 16 字节二进制数据，否则预期为 36 字符的字符串。因此，已存储的非 v7 的 16 字节二进制数据既

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-82738

Vulnerability Information
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Vulnerability Title
Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Input Validation vulnerability in ash-project ash allows an attacker to persistently deny reads of a record by storing a non-version-7 UUID in an Ash.Type.UUIDv7 attribute. Ash.Type.UUIDv7.cast_input/2 accepts any well-formed UUID string, including non-version-7 UUIDs, and stores it as a 16-byte binary. On read, cast_stored/2 (lib/ash/type/uuid_v7.ex) routes the stored binary back through cast_input/2, which since an input-validation tightening in v3.6.3 matches only version-7 (and optionally version-4) 16-byte binaries and otherwise expects a 36-character string. A stored non-v7 16-byte binary matches neither clause and returns :error, so every later read of that record fails. An attacker able to set such an attribute poisons the row permanently. The fix decodes any 16-byte stored binary directly in cast_stored/2. This issue affects ash: from 3.6.3 before 3.32.2.
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
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash 3.6.3 ~ 3.32.2 cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
ash-project ash 751d8a4d11564efbe358c90c8347f3a00eb60782 ~ c453cdc0b8570e86ffef0d10e136247f52b3ea76 cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-82738

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III. Intelligence Information for CVE-2026-82738

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Other References for CVE-2026-82738 (4)

Same Patch Batch · ash-project · 2026-09-01 · 23 CVEs total

CVE-2026-74837 8.7 HIGH Unbounded atom creation from client-supplied RPC field names in AshTypescript field format
CVE-2026-77856 8.2 HIGH Unbounded atom creation from typed struct field names in AshTypescript field selector
CVE-2026-82730 8.2 HIGH Authorization-redacted field values disclosed through AshTypescript result normalization
CVE-2026-77950 6.3 MEDIUM RPC error handler fails open in AshTypescript, disclosing unredacted errors
CVE-2026-82732 6.3 MEDIUM Declared argument constraints not enforced on AshTypescript typed controller routes
CVE-2026-82733 6.3 MEDIUM Route handler return value echoed into AshTypescript error response
CVE-2026-82737 5.9 MEDIUM Ash.Vector wraps the 16-bit dimension header for vectors over 65,535 elements, corrupting
CVE-2026-82735 5.9 MEDIUM Match regex runs on over-length input in Ash.Type.String, enabling regex denial of service
CVE-2026-82747 5.9 MEDIUM Ash.Policy.Authorizer returns records denied by a runtime read policy to any actor
CVE-2026-82742 5.9 MEDIUM Ash.Filter.Runtime materializes a combinatorial cross-product over to-many relationships,
CVE-2026-82745 5.9 MEDIUM ETS and Mnesia data layers overwrite an existing record on create instead of enforcing pri
CVE-2026-82746 5.9 MEDIUM Ash.update_many/4 atomic path skips resource policy authorization, allowing updates to for
CVE-2026-82749 5.9 MEDIUM Ash relationship parent(...) filter degrades to an IS NULL match when the parent field is
CVE-2026-82731 2.3 LOW Unescaped path parameters in AshTypescript generated TypeScript client allow request redir
CVE-2026-82740 2.1 LOW Ash.Type ignores outer array constraints on nested {:array, {:array, type}} inputs
CVE-2026-82739 2.1 LOW Ash.Resource.Validation.Confirm leaks a confirmed field's stored value in the atomic misma
CVE-2026-82741 2.1 LOW Ash.Type.Union with :map_with_tag does not force the tag on dump, enabling tag confusion
CVE-2026-82736 2.1 LOW Ash.Type.CiString validates length and match constraints before case folding, allowing con
CVE-2026-82734 2.1 LOW Non-finite Infinity/NaN decimal values bypass bounds constraints in Ash.Type.Decimal
CVE-2026-82743 2.1 LOW Ash.Actions.Read.AsyncLimiter busy-spins a scheduler while awaiting slow async reads

Showing top 20 of 23 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: ash
Same vendor: ash-project
Same weakness: CWE-20

V. Comments for CVE-2026-82738

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