ash-project ash_authentication_oauth2_server 0.3.0 Client resolve_client allocation of resources

Summaryinfo

A vulnerability was found in ash-project ash_authentication_oauth2_server 0.3.0. It has been declared as problematic. This issue affects the function resolve_client of the component Client. The manipulation results in allocation of resources. This vulnerability was named CVE-2026-82753. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in ash-project ash_authentication_oauth2_server 0.3.0. It has been classified as problematic. Affected is the function resolve_client of the component Client. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to exhaust database storage and memory. The /authorize endpoint is unauthenticated by design. With Client ID Metadata Documents enabled, resolve_client/3 in AshAuthentication.Oauth2Server.CIMD fetches the document for each new URL-shaped client_id and upserts a client row, with no cap on the number of rows, no expiry or garbage collection, and no length bound on the fetched fields; the document was also placed in CIMD.Cache before validation, so even rejected documents held cache memory until their TTL. An attacker serving valid documents at many distinct URLs creates one permanent client row per URL, each able to carry multi-megabyte strings, growing storage and memory without bound. This issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-82753 since 08/31/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 0.3.1 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash_authentication_oauth2_server

Version

• 0.3.0

Website

• Product: https://github.com/ash-project/ash_authentication_oauth2_server/

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CPE 2.2info

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