CVE-2026-8468

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-8468
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.
CVSS

No CVSS.

References
Link Resource
https://cna.erlef.org/cves/CVE-2026-8466.html
https://cna.erlef.org/cves/CVE-2026-8468.html
https://github.com/elixir-plug/plug/commit/2cb7958d33030aa826b0c7404375844d4593d43a
https://github.com/elixir-plug/plug/commit/33858427c7f2737d560a2e40a0c9a9270d77d1d7
https://github.com/elixir-plug/plug/commit/aa69c5ece99c40ded88b8c6581ecc86664b0b734
https://github.com/elixir-plug/plug/commit/d5dfffe25e975585227b1b85d247b0d14164bc45
https://github.com/elixir-plug/plug/commit/df812a1527bae9e941965e897308a2b8bbf83a94
https://github.com/elixir-plug/plug/security/advisories/GHSA-468c-vq7p-gh64
https://osv.dev/vulnerability/EEF-CVE-2026-8468
Configurations

No configuration.

History

14 May 2026, 12:16

Type Values Removed Values Added
Summary (en) Allocation of Resources Without Limits or Throttling vulnerability in plug_project plug allows denial of service via unbounded buffer accumulation in multipart header parsing. plug_multipart in src/plug_multipart.erl is a fork of the cow_multipart module from ninenines cowboy (CVE-2026-8466). The same unbounded accumulation pattern is present in 'Elixir.Plug.Conn':read_part_headers/2 in lib/plug/conn.ex: it accumulates incoming request bytes into a growing binary with no upper-bound check. When plug_multipart:parse_headers/2 returns more or {more, Buffer}, the function reads up to 64 KB from the underlying socket and recurses with the enlarged buffer. There is no equivalent of the byte_size(acc) > length guard present in the sibling function read_part_body/8. An unauthenticated attacker can send a multipart/form-data request whose body never yields a complete header section — for example, a body that never contains the advertised boundary delimiter, or one whose header lines never contain \r\n\r\n — and force the server process to accumulate memory linearly with the bytes the protocol layer is willing to deliver. A handful of concurrent such uploads is sufficient to exhaust BEAM memory. 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. (en) 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.

14 May 2026, 11:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-14 11:16

Updated : 2026-05-14 17:07

NVD link : CVE-2026-8468

Mitre link : CVE-2026-8468

CVE.ORG link : CVE-2026-8468

JSON object : View

Products Affected

No product.

CWE
CWE-770

Allocation of Resources Without Limits or Throttling