{"id":"CVE-2026-65833","kind":"vulnerability","aliases":["CVE-2026-65833"],"related":[],"title":"iopress: chunked request parser over-reads memory, patched in 1.0.5","description":"iopress is a native HTTP server for Node.js with platform-specific async I/O. Prior to version 1.0.5, the chunked-transfer-encoding HTTP request parser in @iopress/core reads past the end of the input buffer when a request declares a chunk size larger than the body actually received. This results in a heap-buffer-over-read. This issue has been patched in version 1.0.5.","summary":"iopress is a native HTTP server for Node.js. Its chunked-transfer request parser in @iopress/core reads past the end of the input buffer when a chunk size exceeds the received body, a heap-buffer-over-read.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["http-server","iopress","node.js","package"],"not_affected_if":["fixed-version","not-using-iopress"],"how_to_check":"- Check the installed `@iopress/core` version with `npm ls @iopress/core`\n- Look for `iopress` or `@iopress/core` in `package.json` and the lockfile","fix":"- `@iopress/core` to `1.0.5` or later","status":"open","published_at":"2026-11-11T19:17:43+00:00","first_seen_at":"2026-11-11T19:28:47+00:00","triaged_at":"2026-11-11T19:30:14+00:00","updated_at":"2026-11-11T19:30:14+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-11T19:30:14Z","model":"claude-haiku-5-5","output":{"fix":"- `@iopress/core` to `1.0.5` or later","reach":"internet","title":"iopress: chunked request parser over-reads memory, patched in 1.0.5","impact":"medium","summary":"iopress is a native HTTP server for Node.js. Its chunked-transfer request parser in @iopress/core reads past the end of the input buffer when a chunk size exceeds the received body, a heap-buffer-over-read.","audience":"developers","category":"package","nicknames":[],"who_cares":["node.js","iopress","http-server"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"Server reads adjacent heap memory, potentially leaking sensitive data","analyst_note":"","how_to_check":"- Check the installed `@iopress/core` version with `npm ls @iopress/core`\n- Look for `iopress` or `@iopress/core` in `package.json` and the lockfile","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["not-using-iopress","fixed-version"],"who_is_affected":"Applications that run iopress as an HTTP server and accept chunked-transfer request bodies from clients are exposed, since the flaw is in the request parser. Projects that do not use iopress, or that run it only behind a trusted proxy that rejects malformed chunked requests, are less exposed; the sources do not say how the proxy case behaves.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00072,"input_tokens":4597,"output_tokens":520,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-65833':14A,17A '1.0.5':11A,79C,127C 'actual':109C 'async':74C 'bodi':55B,108C 'buffer':47B,59B,97C,117C 'chunk':2A,34B,50B,82C,103C 'chunked-transf':33B 'chunked-transfer-encod':81C 'cve':12A,15A 'declar':101C 'encod':84C 'end':43B,93C 'exceed':52B 'heap':58B,116C 'heap-buffer-over-read':57B,115C 'http':19B,28B,66C,85C 'http-server':18B 'i/o':75C 'input':46B,96C 'iopress':1A,21B,24B,62C 'iopress/core':39B,89C 'issu':121C 'larger':105C 'memori':8A 'nativ':27B,65C 'node.js':22B,31B,69C 'over-read':5A 'packag':23B 'parser':4A,37B,87C 'past':41B,91C 'patch':9A,124C 'platform':72C 'platform-specif':71C 'prior':76C 'read':7A,40B,61B,90C,119C 'receiv':54B,110C 'request':3A,36B,86C,100C 'result':112C 'server':20B,29B,67C 'size':51B,104C 'specif':73C 'transfer':35B,83C 'version':78C,126C","nicknames":[],"mitigations":[],"who_affected":"Applications that run iopress as an HTTP server and accept chunked-transfer request bodies from clients are exposed, since the flaw is in the request parser. Projects that do not use iopress, or that run it only behind a trusted proxy that rejects malformed chunked requests, are less exposed; the sources do not say how the proxy case behaves.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["httpserver","iopress","medium","nodejs","package"],"campaign_type":null,"search_a":"'-2026':13A,16A '-65833':14A,17A '1.0.5':11A 'chunk':2A 'cve':12A,15A 'iopress':1A 'memori':8A 'over-read':5A 'parser':4A 'patch':9A 'read':7A 'request':3A","search_b":"'bodi':55B 'buffer':47B,59B 'chunk':34B,50B 'chunked-transf':33B 'end':43B 'exceed':52B 'heap':58B 'heap-buffer-over-read':57B 'http':19B,28B 'http-server':18B 'input':46B 'iopress':21B,24B 'iopress/core':39B 'nativ':27B 'node.js':22B,31B 'packag':23B 'parser':37B 'past':41B 'read':40B,61B 'receiv':54B 'request':36B 'server':20B,29B 'size':51B 'transfer':35B","search_c":"'1.0.5':79C,127C 'actual':109C 'async':74C 'bodi':108C 'buffer':97C,117C 'chunk':82C,103C 'chunked-transfer-encod':81C 'declar':101C 'encod':84C 'end':93C 'heap':116C 'heap-buffer-over-read':115C 'http':66C,85C 'i/o':75C 'input':96C 'iopress':62C 'iopress/core':89C 'issu':121C 'larger':105C 'nativ':65C 'node.js':69C 'parser':87C 'past':91C 'patch':124C 'platform':72C 'platform-specif':71C 'prior':76C 'read':90C,119C 'receiv':110C 'request':86C,100C 'result':112C 'server':67C 'size':104C 'specif':73C 'transfer':83C 'version':78C,126C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-07-03T12:47:53+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-65833","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65833","severity":null,"published_at":"2026-11-11T19:17:43+00:00","modified_at":"2026-11-11T19:17:43+00:00","first_seen_at":"2026-11-11T19:28:47+00:00","fetched_at":"2026-11-11T19:28:47+00:00","note":null}],"documents":[{"id":128144,"url":"https://github.com/senapati484/iopress/releases/tag/v1.0.5","title":"Release notes: github.com","kind":"release","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release notes: github.com"},{"id":128145,"url":"https://github.com/senapati484/iopress/security/advisories/GHSA-pvr5-58cf-rgv6","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-07-03T12:47:53+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}