CVE-2026-8468: Unbounded buffer accumulation in multipart header parsing causes denial of

Description

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

elixir-plug plug

Default version status: unaffected

1.4.0 to < 1.15.4affected
1.16.0 to < 1.16.3affected
1.17.0 to < 1.17.1affected
1.18.0 to < 1.18.2affected
1.19.0 to < 1.19.2affected

pkg:hex/plug

elixir-plug plug

Default version status: unaffected

c52b2f32c90bccd718202bafccb5f95594e30183 to < *affected

pkg:github/elixir-plug/plug

CVE-2026-8468

Unbounded buffer accumulation in multipart header parsing causes denial of service in plug

Description

Affected products

elixir-plug plug

elixir-plug plug

References