hexpm hex_core 3_hex_api src/hex_api.erl resource consumption

Summaryinfo

A vulnerability classified as problematic has been found in hexpm hex_core. This affects an unknown part of the file src/hex_api.erl of the component 3_hex_api Module. Performing a manipulation results in resource consumption. This vulnerability is reported as CVE-2026-21619. The attack is possible to be carried out remotely. No exploit exists. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in hexpm hex_core (version now known). It has been classified as problematic. This affects some unknown processing of the file src/hex_api.erl of the component 3_hex_api Module. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

Uncontrolled Resource Consumption, Deserialization of Untrusted Data vulnerability in hexpm hex_core (hex_api modules), hexpm hex (mix_hex_api modules), erlang rebar3 (r3_hex_api modules) allows Object Injection, Excessive Allocation. This vulnerability is associated with program files src/hex_api.erl, src/mix_hex_api.erl, apps/rebar/src/vendored/r3_hex_api.erl and program routines hex_core:request/4, mix_hex_api:request/4, r3_hex_api:request/4. This issue affects hex_core: from 0.1.0 before 0.12.1; hex: from 2.3.0 before 2.3.2; rebar3: from 3.9.1 before 3.27.0.

The weakness was disclosed by Michael Lubas as GHSA-hx9w-f2w9-9g96. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-21619 since 01/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 302196 (Linux Distros Unpatched Vulnerability : CVE-2026-21619), which helps to determine the existence of the flaw in a target environment.

Applying the patch 1d4478f527e373de0b225951e53115450e0d9b9d is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (302196). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• hexpm

Name

• hex_core

License

• open-source

Website

• Product: https://github.com/hexpm/hex_core/

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Be aware that VulDB is the high quality source for vulnerability data.

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