Vulnerability Description
Allocation of Resources Without Limits or Throttling vulnerability in the WebSocket fragment reassembly of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory via a fragmented message made of many 1-byte continuation frames. Bandit.WebSocket.Connection checks max_fragmented_message_size against the payload bytes received, but keeps every non-final continuation frame as a new list cell around its own binary, and nothing limits the number of fragments. A 1-byte fragment costs 7 bytes on the wire but about 150 to 170 bytes of server memory, so one connection can hold about 150 times the configured limit, roughly 1.2 to 1.4 GB at the default 8 MB. Ping frames between fragments keep the connection alive past the idle timeout. This issue affects bandit: from 1.11.0 before 1.14.0.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-114213.html
- https://github.com/mtrudel/bandit/commit/21612c7c7b1ce43eccd36d3af3a2299d2351366
- https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7
- https://github.com/mtrudel/bandit/security/advisories/GHSA-cpx7-qf6w-jc63
- https://osv.dev/vulnerability/EEF-CVE-2026-114213
FAQ
What is CVE-2026-114213?
CVE-2026-114213 is a documented vulnerability. Allocation of Resources Without Limits or Throttling vulnerability in the WebSocket fragment reassembly of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory via a fragm...
How severe is CVE-2026-114213?
CVSS scoring is not yet available for CVE-2026-114213. Check NVD for updates.
Is there a patch for CVE-2026-114213?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.