elixir-plug up to 1.19.1 lib/plug/conn.ex sibling allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in elixir-plug plug up to 1.15.3/1.16.2/1.17.0/1.18.1/1.19.1. The impacted element is the function sibling in the library lib/plug/conn.ex. Such manipulation leads to allocation of resources. This vulnerability is traded as CVE-2026-8468. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in elixir-plug plug up to 1.15.3/1.16.2/1.17.0/1.18.1/1.19.1. Affected by this issue is the function sibling in the library lib/plug/conn.ex. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. CVE summarizes:

Allocation of Resources Without Limits or Throttling vulnerability in plug_project plug allows denial of service via unbounded buffer accumulation in multipart header parsing. 'Elixir.Plug.Conn':read_part_headers/2 in lib/plug/conn.ex does not obey its :length parameter. There is no upper bound on the size of the accumulated buffer. By contrast, the sibling function read_part_body has an explicit byte_size(acc) > length guard that stops accumulation once a limit is reached. No such guard exists in read_part_headers. An unauthenticated remote attacker can exhaust server memory by sending a crafted multipart/form-data request, causing a denial of service. This issue affects plug from 1.4.0 before 1.15.4, 1.16.3, 1.17.1, 1.18.2, and 1.19.2.

The weakness was shared by José Valim and Jonatan Männchen as GHSA-468c-vq7p-gh64. The advisory is available at github.com. This vulnerability is handled as CVE-2026-8468 since 05/13/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. 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 1.15.4, 1.16.3, 1.17.1, 1.18.2 or 1.19.2 eliminates this vulnerability. Applying the patch 2cb7958d33030aa826b0c7404375844d4593d43a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• elixir-plug

Name

• plug

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.15.0
• 1.15.1
• 1.15.2
• 1.15.3
• 1.16
• 1.16.0
• 1.16.1
• 1.16.2
• 1.17.0
• 1.18.0
• 1.18.1
• 1.19.0
• 1.19.1

License

• open-source

Website

• Product: https://github.com/elixir-plug/plug/

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