Search criteria
2 vulnerabilities by elixir-plug
CVE-2026-8468 (GCVE-0-2026-8468)
Vulnerability from cvelistv5 – Published: 2026-05-14 10:29 – Updated: 2026-05-27 15:41
VLAI
Title
Unbounded buffer accumulation in multipart header parsing causes denial of service in plug
Summary
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.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-plug | plug |
Affected:
1.4.0 , < 1.15.4
(semver)
Affected: 1.16.0 , < 1.16.3 (semver) Affected: 1.17.0 , < 1.17.1 (semver) Affected: 1.18.0 , < 1.18.2 (semver) Affected: 1.19.0 , < 1.19.2 (semver) cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:* |
|
| elixir-plug | plug |
Affected:
c52b2f32c90bccd718202bafccb5f95594e30183 , < *
(git)
cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:* |
Credits
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CVE-2026-32688 (GCVE-0-2026-32688)
Vulnerability from cvelistv5 – Published: 2026-04-27 13:45 – Updated: 2026-04-29 17:08
VLAI
Title
Atom table exhaustion via HTTP/2 :scheme pseudo-header in plug_cowboy
Summary
Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustion.
Plug.Cowboy.Conn.conn/1 in lib/plug/cowboy/conn.ex calls String.to_atom/1 on the value returned by :cowboy_req.scheme/1. For HTTP/2 connections, cowlib passes the client-supplied :scheme pseudo-header value through verbatim without validation. Each unique value permanently allocates a new entry in the BEAM atom table. Since atoms are never garbage-collected and the atom table has a fixed limit (default 1,048,576), an unauthenticated attacker can exhaust the table by sending HTTP/2 requests with unique :scheme values, causing the Erlang VM to abort with system_limit and taking down the entire node.
This vulnerability does not affect HTTP/1.1, where cowboy derives the scheme from the listener type rather than from a client-supplied header.
This issue affects plug_cowboy: from 2.0.0 before 2.8.1.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/elixir-plug/plug_cowboy/securi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-32688.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-32688 | related |
| https://github.com/elixir-plug/plug_cowboy/commit… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-plug | plug_cowboy |
Affected:
2.0.0 , < 2.8.1
(semver)
cpe:2.3:a:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:* |
|
| elixir-plug | plug_cowboy |
Affected:
12ecfd024bb179d48b018fecf074e43fe6a19c83 , < bfb34cb45eb354e56437f7023fb306de1bf9c19b
(git)
cpe:2.3:a:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:* |
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{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Disable HTTP/2 on the \u003ctt\u003ePlug.Cowboy.https/3\u003c/tt\u003e listener by passing \u003ctt\u003eprotocol_options: %{protocols: [:http]}\u003c/tt\u003e in the cowboy options. This restricts the listener to HTTP/1.1, where the scheme is derived from the listener type and is not attacker-controlled."
}
],
"value": "Disable HTTP/2 on the Plug.Cowboy.https/3 listener by passing protocol_options: %{protocols: [:http]} in the cowboy options. This restricts the listener to HTTP/1.1, where the scheme is derived from the listener type and is not attacker-controlled."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-32688",
"datePublished": "2026-04-27T13:45:35.160Z",
"dateReserved": "2026-03-13T09:12:14.475Z",
"dateUpdated": "2026-04-29T17:08:07.227Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}