DivvyPayHQ absinthe_federation up to 0.9.2 entities_field.ex String.to_atom representations allocation of resources

Summaryinfo

A vulnerability was found in DivvyPayHQ absinthe_federation up to 0.9.2 and classified as problematic. This affects the function String.to_atom of the file lib/absinthe/federation/schema/entities_field.ex. The manipulation of the argument representations results in allocation of resources. This vulnerability was named CVE-2026-67585. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in DivvyPayHQ absinthe_federation up to 0.9.2. Affected is the function String.to_atom of the file lib/absinthe/federation/schema/entities_field.ex. The manipulation of the argument representations 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 DivvyPayHQ absinthe_federation allows an unauthenticated remote attacker to abort the Erlang VM via crafted _entities representation keys. Every key of every object in the representations argument of the federation-mandated _entities field is converted with String.to_atom/1 by convert_key/2 in lib/absinthe/federation/schema/entities_field.ex. representations is typed as the open-ended _Any scalar, so its keys bypass schema coercion and the attacker names them freely. Atoms are never garbage collected and the BEAM atom table is hard-capped (about 1,048,576 entries by default), so one request carrying tens of thousands of unique keys creates that many permanent atoms and a handful of such requests exhausts the table and aborts the node. The impact is confined to availability: no data is read or altered, and recovery requires restarting the application. This issue affects absinthe_federation: from 0.1.0 before 0.9.3.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-67585 since 08/07/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 0.9.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-54531). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• DivvyPayHQ

Name

• absinthe_federation

Version

• 0.9.0
• 0.9.1
• 0.9.2

Website

• Product: https://github.com/DivvyPayHQ/absinthe_federation/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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