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CVE-2026-82752— Ash string length constraints count graphemes, so a combining-mark string of any size passes max_length

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 Framework是Ash Framework组织的一款基于Elixir的开发框架。 Ash Framework 0.10.0版本至3.33.0之前版本存在输入验证错误漏洞，该漏洞源于对输入指定数量验证不当，使用Elixir String.length/1按Unicode字素计算字符串长度，导致攻击者可绕过长度限制，在受限属性中存储任意大小的值，造成存储无限增长。

CVSS 5.9 · Medium EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1527

Affected Version Matrix 2

VendorProduct Version RangeStatus
ash-project ash 0.10.0< 3.33.0 affected
05848d5f4affe60fddd812222a18ada080c0813b< * affected
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I. Basic Information for CVE-2026-82752

Vulnerability Information
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Vulnerability Title
Ash string length constraints count graphemes, so a combining-mark string of any size passes max_length
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Validation of Specified Quantity in Input vulnerability in ash-project ash allows an attacker to store a value of arbitrary size in an attribute whose length constraint should bound it. Ash measures string length with Elixir's String.length/1, which counts Unicode graphemes, in the max_length and min_length constraints of Ash.Type.String (apply_constraints/2 in lib/ash/type/string.ex), in Ash.Resource.Validation.StringLength, and in the string_length expression function. A grapheme carries an unbounded number of combining marks, so a base character followed by a million combining acute accents is one grapheme and megabytes of data, and satisfies max_length: 2. Where the data layer imposes no independent limit (ETS, Mnesia, or a Postgres text column) the whole value is persisted, so an attacker can write an entire request body into an attribute declared with a small maximum and grow storage without bound. The counting unit also disagrees with the storage layer, which counts codepoints rather than graphemes, so a value accepted by the constraint can still be rejected or truncated by the column. A Postgres varchar(n) column bounds the value itself and is not exposed. This issue affects ash: from 0.10.0 before 3.33.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
Ash Framework 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ash Framework是Ash Framework组织的一款基于Elixir的开发框架。 Ash Framework 0.10.0版本至3.33.0之前版本存在输入验证错误漏洞，该漏洞源于对输入指定数量验证不当，使用Elixir String.length/1按Unicode字素计算字符串长度，导致攻击者可绕过长度限制，在受限属性中存储任意大小的值，造成存储无限增长。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash 0.10.0 ~ 3.33.0 cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
ash-project ash 05848d5f4affe60fddd812222a18ada080c0813b ~ * cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-82752

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III. Intelligence Information for CVE-2026-82752

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Vendor Advisories for CVE-2026-82752 (2)

Other References for CVE-2026-82752 (1)

IV. Related Vulnerabilities

Same product: ash
Same vendor: ash-project
Same weakness: CWE-1284

V. Comments for CVE-2026-82752

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