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CVE-2026-82726: CWE-625 Permissive Regular Expression in ash-project ash_phoenix

0
Medium
VulnerabilityCVE-2026-82726cvecve-2026-82726cwe-625cwe-178
Published: 08/31/2026 (08/31/2026, 03:05:38 UTC)
Source: CVE Database V5
Vendor/Project: ash-project
Product: ash_phoenix

Description

Permissive Regular Expression vulnerability in ash-project ash_phoenix lets a remote client select the tenant an Ash application uses, or degrade the request, by sending a crafted Host header. AshPhoenix.Helpers.get_subdomain/2 stripped the root domain with String.replace(host, ~r/.?#{root_host}/, ""). The root host was interpolated raw, so each . became a wildcard and any metacharacter a pattern, and the replace was global and unanchored, so a match was removed from anywhere in the string. With root_host example.com, Host: foo.exampleXcom.attacker.net returned the tenant foo.attacker.net. A metacharacter-bearing or nil root host degraded the pattern or raised on every request. The comparison was also case-sensitive, so TENANT.EXAMPLE.COM and EXAMPLE.COM slipped past the root-host allowlist. conn.host comes from the client Host header. The fix matches the root host case-insensitively and only as an exact trailing suffix. This issue affects ash_phoenix: from 2.1.26 before 2.3.25.

CVSS v4.0

Score 6.3medium

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
Low
Vuln. Integrity
Low
Vuln. Availability
Low
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Affected software

ash_phoenix
pkg:hex/ash_phoenix
Affected versions
>=2.1.26 <2.3.25
GitHub Actionsmore threats →cve
ash-project/ash_phoenix
pkg:github/ash-project/ash_phoenix
CPE configurations
cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*

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Technical Details

Data Version
5.2
Assigner Short Name
EEF
Date Reserved
2026-08-31T00:59:08.960Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a94f72bacd9273b497b1a24

Added to database: 08/31/2026, 03:38:19 UTC

Last updated: 08/31/2026, 03:38:19 UTC

Views: 1

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