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CVE-2026-55736— Private action arguments can be set by user input in Ash

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团队开源的一个用于构建Elixir应用程序的框架。 Ash Framework 3.0.0版本至3.29.3之前版本存在输入验证错误漏洞，该漏洞源于对于动态确定对象属性的修改控制不当，可能导致攻击者设置私有动作参数的值，从而可能引发完整性违反或权限提升。

AI Predicted 8.8 Difficulty: Easy EPSS 0.37% · P28

Affected Version Matrix 2

VendorProduct Version RangeStatus
ash-project ash 3.0.0< 3.29.3 affected
5967ed3a483ab949866e6d7b043b043e61703f17< d9b3100219b3ea86d73202bf7368c03a7688efea affected
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I. Basic Information for CVE-2026-55736

Vulnerability Information
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Vulnerability Title
Private action arguments can be set by user input in Ash
Source: CVE Program / CVE List V5
Vulnerability Description
Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in ash-project ash allows a user to set the value of a private action argument that is intended to be controlled only by trusted server-side code. Action arguments declared with public?: false are meant to be set internally (for example via Ash.Changeset.set_private_argument/3) and must not be settable from end-user input. When a changeset is built from a parameter map, Ash filters out private arguments, but the filtering is incomplete. In the regular changeset path (for_create, for_update, for_destroy), private arguments are stripped only when the parameter key is an atom. When the key is a binary (string), as is the case for user-supplied parameters, the private argument is kept and the user controls its value. In the atomic path (Ash.Changeset.fully_atomic_changeset/4, also reached through atomic and bulk updates), private arguments are not stripped at all, regardless of whether the key is an atom or a binary. An attacker who can submit parameters to an action that defines a private argument can therefore inject a value for that argument. Depending on how the application uses the argument (for example an acting_user_id driving authorization or record ownership), this can lead to an integrity violation or privilege escalation. This issue affects ash: from 3.0.0 before 3.29.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
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团队开源的一个用于构建Elixir应用程序的框架。 Ash Framework 3.0.0版本至3.29.3之前版本存在输入验证错误漏洞，该漏洞源于对于动态确定对象属性的修改控制不当，可能导致攻击者设置私有动作参数的值，从而可能引发完整性违反或权限提升。
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 3.0.0 ~ 3.29.3 cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
ash-project ash 5967ed3a483ab949866e6d7b043b043e61703f17 ~ d9b3100219b3ea86d73202bf7368c03a7688efea cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-55736

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III. Intelligence Information for CVE-2026-55736

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Patches & Fixes for CVE-2026-55736 (1)

Vendor Advisories for CVE-2026-55736 (3)

IV. Related Vulnerabilities

Same product: ash
Same vendor: ash-project
Same weakness: CWE-915

V. Comments for CVE-2026-55736

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