Unbounded buffer accumulation in multipart header parsing causes denial of service in plug_CVE-2026-8468

{
    "lastseen": "",
    "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.\n\n'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.\n\nThis issue affects plug from 1.4.0 before 1.15.4, 1.16.3, 1.17.1, 1.18.2, and 1.19.2.",
    "published": "2026-05-14T10:29:51.062Z",
    "modified": "2026-05-14T10:56:21.031Z",
    "type": "cve",
    "title": "Unbounded buffer accumulation in multipart header parsing causes denial of service in plug",
    "source": "EEF",
    "references": "https://github.com/elixir-plug/plug/security/advisories/GHSA-468c-vq7p-gh64\nhttps://cna.erlef.org/cves/CVE-2026-8468.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-8468\nhttps://cna.erlef.org/cves/CVE-2026-8466.html\nhttps://github.com/elixir-plug/plug/commit/2cb7958d33030aa826b0c7404375844d4593d43a\nhttps://github.com/elixir-plug/plug/commit/aa69c5ece99c40ded88b8c6581ecc86664b0b734\nhttps://github.com/elixir-plug/plug/commit/d5dfffe25e975585227b1b85d247b0d14164bc45\nhttps://github.com/elixir-plug/plug/commit/df812a1527bae9e941965e897308a2b8bbf83a94\nhttps://github.com/elixir-plug/plug/commit/33858427c7f2737d560a2e40a0c9a9270d77d1d7",
    "id": "CVE-2026-8468",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "elixir-plug plug 1.4.0\nelixir-plug plug 1.16.0\nelixir-plug plug 1.17.0\nelixir-plug plug 1.18.0\nelixir-plug plug 1.19.0\nelixir-plug plug c52b2f32c90bccd718202bafccb5f95594e30183",
    "sourceHref": "",
    "cvss": {
        "score": 8.2,
        "severity": "HIGH",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "plug",
    "version": "1.4.0",
    "vendor": "elixir-plug",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}