Vulnerability Description
Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/2 implementation of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory via DATA frames sent past the advertised receive window. The attacker requests a response larger than the 65,535-byte initial window and withholds WINDOW_UPDATE, so the stream process blocks while sending and stops reading, then floods small DATA frames on that stream. Every frame is queued in the stream's mailbox until the BEAM node runs out of memory. Bandit.HTTP2.Connection.handle_frame/3 in lib/bandit/http2/connection.ex forwards each DATA frame to the stream process without consulting the receive window, and Bandit.HTTP2.FlowControl.compute_recv_window/2 replenishes the window as data arrives rather than as it is consumed, and never answers a violation with FLOW_CONTROL_ERROR. This issue affects bandit: from 0.3.1 before 1.14.0.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-108525.html
- https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7
- https://github.com/mtrudel/bandit/commit/c8dc1e97050cf359f61ed6cdd110f3cdaf1d6f5
- https://github.com/mtrudel/bandit/security/advisories/GHSA-c3g7-2pg5-qvwh
- https://osv.dev/vulnerability/EEF-CVE-2026-108525
FAQ
What is CVE-2026-108525?
CVE-2026-108525 is a documented vulnerability. Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/2 implementation of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory via DATA frames sen...
How severe is CVE-2026-108525?
CVSS scoring is not yet available for CVE-2026-108525. Check NVD for updates.
Is there a patch for CVE-2026-108525?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.