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CVE-2026-82735: CWE-400 Uncontrolled Resource Consumption in ash-project ash

0
Medium
VulnerabilityCVE-2026-82735cvecve-2026-82735cwe-400
Published: 09/01/2026 (09/01/2026, 03:19:36 UTC)
Source: CVE Database V5
Vendor/Project: ash-project
Product: ash

Description

Uncontrolled Resource Consumption vulnerability in ash-project ash allows an attacker to force an expensive regular expression to run on input that a length constraint should have already rejected. Ash.Type.String.apply_constraints/2 (lib/ash/type/string.ex) evaluated the :match regex regardless of the min_length and max_length constraints on the same attribute. Because the length check did not gate the regex, an over-length value that the length constraint rejects still had the pattern applied to it, so the length limit that would otherwise bound the work never constrained the regex input. Against a backtracking pattern this yields catastrophic regex evaluation on attacker-sized input, and even a linear pattern runs on arbitrarily large input, consuming CPU per request. The fix skips the :match regex whenever a length constraint is violated, making the two checks order-independent. This issue affects ash: from 0.10.0 before 3.32.2.

CVSS v4.0

Score 5.9medium

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
None
Vuln. Integrity
None
Vuln. Availability
High
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
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

Affected software

ash
pkg:hex/ash
Affected versions
>=0.10.0 <3.32.2
GitHub Actionsmore threats →cve
ash-project/ash
pkg:github/ash-project/ash
CPE configurations
cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*

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Technical Details

Data Version
5.2
Assigner Short Name
EEF
Date Reserved
2026-08-31T00:59:10.001Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a964897acd9273b49296a83

Added to database: 09/01/2026, 03:37:59 UTC

Last updated: 09/01/2026, 03:37:59 UTC

Views: 1

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