{"id":"CVE-2026-113436","aliases":[],"cve":{"records":[{"id":"CVE-2026-113436","source":"EEF","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-23T10:30:01.881Z","published":"2026-10-26T13:31:35.033Z","modified":"2026-10-26T15:35:51.556Z"}],"publishers":[{"name":"EEF","role":"CNA","organizationId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","modified":"2026-10-26T13:31:35.033Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-26T15:35:51.556Z"}],"references":[{"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-29cr-8477-rg6r","tags":["vendor-advisory","related"],"source":"EEF"},{"url":"https://cna.erlef.org/cves/CVE-2026-113436.html","tags":["related"],"source":"EEF"},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-113436","tags":["related"],"source":"EEF"},{"url":"https://github.com/mtrudel/bandit/commit/e0c8c0c30af9b0f57d8aafac37ddd9294363a8be","tags":["related"],"source":"EEF"},{"url":"https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a","tags":["patch"],"source":"EEF"}],"weaknesses":[{"id":"CWE-407","description":"CWE-407 Inefficient Algorithmic Complexity","source":"EEF"}],"applicability":[{"source":"EEF","statements":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*","versionEndExcluding":"1.14.0","versionStartIncluding":"1.0.0-pre.7","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"AND"}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-26T15:12:04.626946Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Quadratic bignum parsing of Content-Length and Host port values in Bandit","titleSource":"EEF","descriptionSource":"EEF","description":"Inefficient Algorithmic Complexity vulnerability in the header integer parser of mtrudel bandit allows an unauthenticated remote attacker to consume server CPU via a content-length value or a Host or :authority port made of thousands of digits.\n\nBandit.Headers.parse_integer/2 in lib/bandit/headers.ex builds the number one digit at a time with no limit on the digit count, allocating a new bignum at each step, so one value costs time quadratic in its length. It runs on raw request input over HTTP/1 and HTTP/2, before any range check. Over HTTP/2, a 4,000-digit value can be stored once in the HPACK dynamic table and re-sent on each new stream for about one byte: 124 KB of traffic kept the server busy for 27.9 s.\n\nThis issue affects bandit: from 1.0.0-pre.7 before 1.14.0.","score":8.7,"severity":"high","published":"2026-10-26T13:31:35.033Z","modified":"2026-10-26T15:35:51.556Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"mtrudel","name":"bandit","platforms":[],"versions":[{"version":"1.0.0-pre.7","status":"affected","lessThan":"1.14.0","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:hex/bandit","packageIdentity":{"ecosystem":"Hex","name":"bandit"},"cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"source":"EEF","url":"https://www.cve.org/CVERecord?id=CVE-2026-113436"},{"vendor":"mtrudel","name":"bandit","platforms":[],"versions":[{"version":"e0c8c0c30af9b0f57d8aafac37ddd9294363a8be","status":"affected","lessThan":"220b9dfd27f9a21305be2afc75cbe585ddc24e7a","versionType":"git"}],"defaultStatus":"unaffected","packageURL":"pkg:github/mtrudel/bandit","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"source":"EEF","url":"https://www.cve.org/CVERecord?id=CVE-2026-113436"}],"remediation":[],"references":["https://github.com/mtrudel/bandit/security/advisories/GHSA-29cr-8477-rg6r","https://cna.erlef.org/cves/CVE-2026-113436.html","https://osv.dev/vulnerability/EEF-CVE-2026-113436","https://github.com/mtrudel/bandit/commit/e0c8c0c30af9b0f57d8aafac37ddd9294363a8be","https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a"],"sources":[{"name":"CVE","id":"CVE-2026-113436","modified":"2026-10-26T15:35:51.556Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-113436"}],"assessments":[{"source":"EEF","vector":"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","score":8.7}],"sourceAffected":[],"observedAt":"2026-10-29T14:32:34.295Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T09:15:31.262Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"Bandit versions before 1.14.0 have an inefficient algorithmic complexity vulnerability, allowing an unauthenticated remote attacker to consume server CPU with a large Content-Length or Host port value. The issue affects versions from 1.0.0-pre.7. An attacker can send a value with thousands of digits to exploit this weakness.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:37:55.701Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-113436"}]}}