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CVE-2026-56814: CWE-770 Allocation of Resources Without Limits or Throttling in elixir-plug plug

0
Medium
VulnerabilityCVE-2026-56814cvecve-2026-56814cwe-770
Published: 07/10/2026 (07/10/2026, 11:14:35 UTC)
Source: CVE Database V5
Vendor/Project: elixir-plug
Product: plug

Description

Plug.Parsers.MULTIPART, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its :length budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the :length limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero. Because every part whose Content-Disposition carries a non-empty filename creates a fresh temporary file (via Plug.Upload) and retains a Plug.Upload struct for the duration of the request, an attacker can send a single request composed of many empty-body file parts. Such a request stays well under the configured :length limit (8,000,000 bytes by default) while creating one temporary file per part, leading to inode and disk exhaustion and unbounded memory growth. Any application using Plug.Parsers with the :multipart parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP. This vulnerability is associated with program files lib/plug/parsers/multipart.ex and program routines Plug.Parsers.MULTIPART.parse_multipart/2, Plug.Parsers.MULTIPART.parse_multipart_headers/5, Plug.Parsers.MULTIPART.parse_multipart_body/4, and Plug.Parsers.MULTIPART.parse_multipart_file/4. This issue affects plug: from 1.4.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.0 before 1.19.5, and from 1.20.0 before 1.20.3.

CVSS v4.0

Score 6.9medium

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
None
Vuln. Integrity
None
Vuln. Availability
Low
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected software

plug
pkg:hex/plug
Affected versions
>=1.4.0 <1.16.6>=1.17.0 <1.17.4>=1.18.0 <1.18.5>=1.19.0 <1.19.5>=1.20.0 <1.20.3
GitHub Actionsmore threats →cve
elixir-plug/plug
pkg:github/elixir-plug/plug
CPE configurations
cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*

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Technical Details

Data Version
5.2
Assigner Short Name
EEF
Date Reserved
2026-06-23T12:29:02.507Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a50e30a68715ace4389e0ee

Added to database: 07/10/2026, 12:18:18 UTC

Last updated: 07/10/2026, 12:18:18 UTC

Views: 1

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