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Medium

HTTP/2 frame size limit checked after body is buffered in bandit

Type: advisorySources: OSV

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated memory exhaustion via oversized HTTP/2 frames. '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). An 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. This issue affects bandit: from 0.3.6 before 1.11.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-42788
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 09:32 UTC · Revision 1

Source evidence

HTTP/2 frame size limit checked after body is buffered in bandit

core-osv · Original source

Published 1 May 2026, 20:34 UTC

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated memory exhaustion via oversized HTTP/2 frames. '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). An 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. This issue affects bandit: from 0.3.6 before 1.11.0.

osv:CVE-2026-42788
Complete source record
{
  "id": "35628f9620a03e231e974ea238ecc3feccda7a5dbaa288cffec27fba906033ce",
  "url": "https://osv.dev/vulnerability/CVE-2026-42788",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HTTP/2 frame size limit checked after body is buffered in bandit",
    "summary": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated memory exhaustion via oversized HTTP/2 frames. '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). An 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. This issue affects bandit: from 0.3.6 before 1.11.0.",
    "evidence": "osv:CVE-2026-42788",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-42788",
      "aliases": [
        "CVE-2026-42788",
        "EEF-CVE-2026-42788",
        "GHSA-q6v9-r226-v65f"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
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      "affected": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42788.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.250044642Z",
      "provider": "osv",
      "references": [
        "https://cna.erlef.org/cves/CVE-2026-42788.html",
        "https://github.com",
        "https://osv.dev/vulnerability/EEF-CVE-2026-42788",
        "https://repo.hex.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42788.json",
        "https://github.com/mtrudel/bandit/security/advisories/GHSA-q6v9-r226-v65f",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42788",
        "https://github.com/mtrudel/bandit/commit/1e8e55966da9129016b73d32f0e1df4630e3b463",
        "https://github.com/mtrudel/bandit"
      ],
      "provider_metadata": {
        "cwe_ids": [
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        ],
        "cna_assigner": "EEF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42788.json"
      }
    },
    "related_cves": [
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        "value": "CVE-2026-42788",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518889,
  "published_at": "2026-05-01T20:34:11.911+00:00"
}