{"id":"CVE-2026-115269","summary":"HTTP/2 WINDOW_UPDATE and SETTINGS frames reset the request body read timeout in Bandit","details":"Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/2 request body reader of mtrudel bandit allows an unauthenticated remote attacker to hold stream processes open indefinitely via WINDOW_UPDATE or empty SETTINGS frames sent while a Plug reads the request body.\n\nBandit.HTTP2.Stream.do_read_data/4 in lib/bandit/http2/stream.ex waits for each frame with a fresh read_timeout. A stream WINDOW_UPDATE, or the zero-delta window update that every empty SETTINGS frame delivers to all streams, ends the wait without delivering any body data, and the loop starts a new full countdown. A client that sends one of these 9-byte frames before each countdown expires keeps read_body blocked, together with the stream process and whatever the application holds while reading, for as long as it likes.\n\nThis issue affects bandit: from 1.4.0 before 1.14.0.","aliases":["EEF-CVE-2026-115269","GHSA-p2qv-vx88-385x"],"modified":"2026-10-28T02:56:13.901900050Z","published":"2026-10-26T13:30:24.621Z","database_specific":{"cwe_ids":["CWE-770","CWE-835"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115269.json","cna_assigner":"EEF"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-115269.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-115269"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115269.json"},{"type":"ADVISORY","url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-p2qv-vx88-385x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115269"},{"type":"FIX","url":"https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"},{"type":"FIX","url":"https://github.com/mtrudel/bandit/commit/fff06efe3be962b484bd4d3eb339372fda5a231f"},{"type":"PACKAGE","url":"https://github.com/mtrudel/bandit"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mtrudel/bandit","events":[{"introduced":"fff06efe3be962b484bd4d3eb339372fda5a231f"},{"fixed":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a"},{"introduced":"e5d4262b07b3e1026c57647b281dccfababea13b"},{"fixed":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a"},{"fixed":"fff06efe3be962b484bd4d3eb339372fda5a231f"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"fff06efe3be962b484bd4d3eb339372fda5a231f"},{"fixed":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a"}]},{"range":[{"introduced":"1.4.0"},{"fixed":"1.14.0"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"range":[{"fixed":"fff06efe3be962b484bd4d3eb339372fda5a231f"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a"}]}]}}],"versions":["1.13.1","1.13.0","1.12.5","1.12.4","1.12.3","1.12.1","1.12.0","1.11.1","1.11.0","1.10.4","1.10.3","1.10.2","1.10.1","1.10.0","1.9.0","1.8.0","1.7.0","1.6.11","1.6.10","1.6.9","1.6.8","1.6.7","1.6.6","1.6.5","1.6.4","1.6.3","1.6.2","1.6.1","1.6.0","1.5.7","1.5.6","1.5.5","1.5.4","1.5.3","1.5.2","1.5.1","1.5.0","1.4.2","1.4.1","1.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115269.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}