HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation_CVE-2026-49754

{
    "lastseen": "",
    "description": "Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood).\n\nWhen Mint's HTTP/2 receive path observes a HEADERS frame without the END_HEADERS flag, the unparsed header-block fragment is parked in conn.headers_being_processed, and every subsequent CONTINUATION frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no CONTINUATION frame-count limit, and max_header_list_size is only enforced on outgoing requests, never on inbound header blocks (its default is :infinity).\n\nA malicious or compromised HTTP/2 server can stream an endless sequence of CONTINUATION frames (each up to the peer-advertised SETTINGS_MAX_FRAME_SIZE) and drive the client's iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\n\nThis issue affects mint: from 0.1.0 before 1.9.0.",
    "published": "2026-06-02T14:15:14.951Z",
    "modified": "2026-06-02T14:15:14.951Z",
    "type": "cve",
    "title": "HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation",
    "source": "EEF",
    "references": "https://github.com/elixir-mint/mint/security/advisories/GHSA-2p26-p43x-fhp8\nhttps://cna.erlef.org/cves/CVE-2026-49754.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-49754\nhttps://github.com/elixir-mint/mint/commit/b662d127d3028b5426c88d4c9cc7fe430491a10b",
    "id": "CVE-2026-49754",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "elixir-mint mint 0.1.0\nelixir-mint mint 596ca4304504be68939c4929e0831557097962b8",
    "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": "mint",
    "version": "0.1.0",
    "vendor": "elixir-mint",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}