{"id":"CVE-2026-111101","published":"2026-10-26T14:16:27.227","lastModified":"2026-10-26T16:59:16.113","description":"Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory and CPU via a request body made of many 1-byte chunks.\n\nThe chunked reader in lib/bandit/http1/socket.ex keeps every chunk as its own list cell and binary term until IO.iodata_to_binary/1 joins them, and nothing limits the number of chunks. The :length option of read_body/2 counts only data bytes, so tiny chunks cost far more memory than their payload: 48 MB of 1-byte chunks grew one handler process to about 500 MB and took about 6 s of CPU. The route does not need to read the body, because on keep-alive connections ensure_completed/1 drains unread bodies through the same reader.\n\nThis issue affects bandit: from 0.1.0 before 1.14.0.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-770"],"vendors":[],"products":[],"references":[{"url":"https://cna.erlef.org/cves/CVE-2026-111101.html","tags":[]},{"url":"https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a","tags":[]},{"url":"https://github.com/mtrudel/bandit/commit/7201270c34b90f6c9e15c0386c2bb802c0c72ab4","tags":[]},{"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-jwh3-j29h-qfmw","tags":[]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-111101","tags":[]}],"exploitRefs":[{"url":"https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a","tags":[]},{"url":"https://github.com/mtrudel/bandit/commit/7201270c34b90f6c9e15c0386c2bb802c0c72ab4","tags":[]},{"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-jwh3-j29h-qfmw","tags":[]}],"hasPoc":true,"ai":null}