{
"id": "GHSA-468c-vq7p-gh64",
"aliases": [
"CVE-2026-8468"
],
"details": "### Summary\n\nAn Allocation of Resources Without Limits or Throttling vulnerability in `Plug.Conn.read_part_headers/2` allows an unauthenticated attacker to exhaust server memory by sending a crafted `multipart/form-data` request, causing a denial of service.\n\n### Details\n\n`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`.\n\n### Impact\n\nThis is a denial-of-service vulnerability. Any application using `Plug.Parsers` with the `:multipart` parser, or calling `Plug.Conn.read_part_headers/2` directly, is affected. An unauthenticated remote attacker can trigger the issue by sending crafted HTTP requests with no special privileges.\n\n### References\n\n* Intro Commit: https://github.com/elixir-plug/plug/commit/c52b2f32c90bccd718202bafccb5f95594e30183\n* Patch Commit: https://github.com/elixir-plug/plug/commit/d878b42efea9f12b243dc3e362a2ed048a798203",
"summary": "Plug: Unbounded buffer accumulation in multipart header parsing causes denial of service",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.4.0"
},
{
"fixed": "1.15.4"
}
]
}
],
"package": {
"name": "plug",
"ecosystem": "Hex"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.16.0"
},
{
"fixed": "1.16.3"
}
]
}
],
"package": {
"name": "plug",
"ecosystem": "Hex"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.17.0"
},
{
"fixed": "1.17.1"
}
]
}
],
"package": {
"name": "plug",
"ecosystem": "Hex"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.18.0"
},
{
"fixed": "1.18.2"
}
]
}
],
"package": {
"name": "plug",
"ecosystem": "Hex"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.19.0"
},
{
"fixed": "1.19.2"
}
]
}
],
"package": {
"name": "plug",
"ecosystem": "Hex"
}
}
],
"modified": "2026-05-20T15:35:13Z",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"published": "2026-05-20T15:35:13Z",
"references": [
{
"url": "https://github.com/elixir-plug/plug/security/advisories/GHSA-468c-vq7p-gh64",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8468",
"type": "ADVISORY"
},
{
"url": "https://github.com/elixir-plug/plug/commit/2cb7958d33030aa826b0c7404375844d4593d43a",
"type": "WEB"
},
{
"url": "https://github.com/elixir-plug/plug/commit/33858427c7f2737d560a2e40a0c9a9270d77d1d7",
"type": "WEB"
},
{
"url": "https://github.com/elixir-plug/plug/commit/aa69c5ece99c40ded88b8c6581ecc86664b0b734",
"type": "WEB"
},
{
"url": "https://github.com/elixir-plug/plug/commit/d5dfffe25e975585227b1b85d247b0d14164bc45",
"type": "WEB"
},
{
"url": "https://github.com/elixir-plug/plug/commit/df812a1527bae9e941965e897308a2b8bbf83a94",
"type": "WEB"
},
{
"url": "https://cna.erlef.org/cves/CVE-2026-8466.html",
"type": "WEB"
},
{
"url": "https://cna.erlef.org/cves/CVE-2026-8468.html",
"type": "WEB"
},
{
"url": "https://github.com/elixir-plug/plug",
"type": "PACKAGE"
},
{
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-8468",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-770"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-05-14T11:16:18Z",
"github_reviewed_at": "2026-05-20T15:35:13Z"
}
}