CVE-2026-8468: Elixir-Plug Plug

High severity, CVSS 8.2. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Elixir-Plug Plug: from 1.4.0, before 1.15.4 (fixed in 1.15.4); from 1.16.0, before 1.16.3 (fixed in 1.16.3); from 1.17.0, before 1.17.1 (fixed in 1.17.1); from 1.18.0, before 1.18.2 (fixed in 1.18.2); from 1.19.0, before 1.19.2 (fixed in 1.19.2)

Published 2026-05-14. Last modified 2026-06-17.