HTTP/2 frame size limit checked after body is buffered in bandit_CVE-2026-42788

{
    "lastseen": "",
    "description": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated memory exhaustion via oversized HTTP/2 frames.\n\n'Elixir.Bandit.HTTP2.Frame':deserialize/2 in lib/bandit/http2/frame.ex checks the SETTINGS_MAX_FRAME_SIZE limit only after pattern-matching payload::binary-size(length), which requires the entire frame body to be present in memory before either the accept or reject clause can fire. A peer that announces a frame length up to the 24-bit maximum (~16 MiB) causes the server to buffer that entire body before the size guard is evaluated, regardless of the max_frame_size negotiated during the HTTP/2 handshake (default 16 KiB per RFC 9113).\n\nAn unauthenticated attacker holding many concurrent connections can force the server to buffer far more memory than the negotiated frame size limit should permit, leading to memory pressure and potential denial of service.\n\nThis issue affects bandit: from 0.3.6 before 1.11.0.",
    "published": "2026-05-01T20:34:11.911Z",
    "modified": "2026-05-01T20:34:11.911Z",
    "type": "cve",
    "title": "HTTP/2 frame size limit checked after body is buffered in bandit",
    "source": "EEF",
    "references": "https://github.com/mtrudel/bandit/security/advisories/GHSA-q6v9-r226-v65f\nhttps://cna.erlef.org/cves/CVE-2026-42788.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-42788\nhttps://github.com/mtrudel/bandit/commit/1e8e55966da9129016b73d32f0e1df4630e3b463",
    "id": "CVE-2026-42788",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "mtrudel bandit 0.3.6\nmtrudel bandit f00dd69a5b2a4863be585907acd853c4ffd41399",
    "sourceHref": "",
    "cvss": {
        "score": 6.9,
        "severity": "MEDIUM",
        "vector": "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",
        "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": "bandit",
    "version": "0.3.6",
    "vendor": "mtrudel",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}