Weakness Type (CWE)

CWE-770 — CWE-770 Allocation of Resources Without Limits or Throttling

CAPEC

CVSS 4.0 Score

6.9

MEDIUM

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

Vulnerability description

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.

Affected

pkg:hex/bandit

Module Source File Routine
Bandit.HTTP2.Frame lib/bandit/http2/frame.ex Bandit.HTTP2.Frame.deserialize/2
Status Type Version Changes / Fixed in
affected semver ⓘ 0.3.6 < 1.11.0

pkg:github/mtrudel/bandit

Module Source File Routine
Bandit.HTTP2.Frame lib/bandit/http2/frame.ex Bandit.HTTP2.Frame.deserialize/2
Status Type Version Changes / Fixed in
affected git ⓘ f00dd69a5b < 1.11.0

References

Credits

  • Finder: Peter Ullrich
  • Remediation developer: Mat Trudel
  • Analyst: Jonatan Männchen

CVE record as JSON:  GET /cves/CVE-2026-42788.json
OSV record as JSON:  GET /osv/EEF-CVE-2026-42788.json