Riskcovery

CVE-2026-8468

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

State
Published
Severity
8.2 High
Published
May 14, 2026
Updated
May 27, 2026
Reserved
May 13, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
4.08.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NEEF

Weaknesses

  • CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

ProductVersions
plugelixir-plug
  • 1.4.0 to before 1.15.4Affected
  • 1.16.0 to before 1.16.3Affected
  • 1.17.0 to before 1.17.1Affected
  • 1.18.0 to before 1.18.2Affected
  • 1.19.0 to before 1.19.2Affected
plugelixir-plug
  • c52b2f32c90bccd718202bafccb5f95594e30183 and laterAffectedfrom 2cb7958d33030aa826b0c7404375844d4593d43aNot affectedfrom aa69c5ece99c40ded88b8c6581ecc86664b0b734Not affectedfrom d5dfffe25e975585227b1b85d247b0d14164bc45Not affectedfrom df812a1527bae9e941965e897308a2b8bbf83a94Not affectedfrom 33858427c7f2737d560a2e40a0c9a9270d77d1d7Not affected

References

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