{"id":"CVE-2026-62303","aliases":[],"cve":{"records":[{"id":"CVE-2026-62303","source":"GitHub_M","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-07-13T19:27:58.313Z","published":"2026-10-30T18:58:10.308Z","modified":"2026-10-30T18:58:10.308Z"}],"publishers":[{"name":"GitHub_M","role":"CNA","organizationId":"a0819718-46f1-4df5-94e2-005712e83aaa","modified":"2026-10-30T18:58:10.308Z"}],"references":[{"url":"https://github.com/pistacheio/pistache/security/advisories/GHSA-q474-pqcp-gqm5","tags":["x_refsource_CONFIRM"],"source":"GitHub_M"},{"url":"https://github.com/pistacheio/pistache/commit/935461352403696f3ca0dbb9a7de7d2609e7ce91","tags":["x_refsource_MISC"],"source":"GitHub_M"}],"weaknesses":[{"id":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","source":"GitHub_M"},{"id":"CWE-674","description":"CWE-674: Uncontrolled Recursion","source":"GitHub_M"}],"applicability":[],"prioritization":[]},"title":"Pistache: DoS via stack exhaustion in REST router path normalization (regex_replace on long slash runs)","titleSource":"GitHub_M","descriptionSource":"GitHub_M","description":"Pistache is a high-performance REST toolkit written in C++. From 0.0.5 through 0.4.26, `SegmentTreeNode::sanitizeResource()` in `src/server/router.cc` uses `std::regex_replace()` with the `//+` expression to collapse consecutive slashes. With libstdc++, a path containing tens of thousands of consecutive slash characters can recurse deeply enough to exhaust the stack and crash the process. `Router::route()`, `Router::addRoute()` and `Router::removeRoute()` reach this normalization. Unauthenticated remote exploitation is conditional on a deployment allowing sufficiently long request paths, such as by increasing `Endpoint::Options::maxRequestSize()` above the default 4096-byte limit or forwarding long paths through a front end. Direct router API use is also affected when attacker-controlled route or resource strings reach the normalizer. Native builds reproduced a crash around 24,000 consecutive slashes, although the exact threshold depends on the stack and standard library; the demonstrated failure is stack exhaustion rather than uninitialized-memory use. A source fix replaces recursive regular-expression normalization with an iterative pass, but no containing repository release was verified as of time of publication.","score":5.9,"severity":"medium","published":"2026-10-30T18:58:10.308Z","modified":"2026-10-30T18:58:10.308Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"pistacheio","name":"pistache","platforms":[],"versions":[{"version":">= 0.0.5, <= 0.4.26","status":"affected"}],"cpes":[],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-62303"}],"remediation":[],"references":["https://github.com/pistacheio/pistache/security/advisories/GHSA-q474-pqcp-gqm5","https://github.com/pistacheio/pistache/commit/935461352403696f3ca0dbb9a7de7d2609e7ce91"],"sources":[{"name":"CVE","id":"CVE-2026-62303","modified":"2026-10-30T18:58:10.308Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-62303"}],"assessments":[{"source":"GitHub_M","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9}],"sourceAffected":[],"observedAt":"2026-10-30T21:44:41.460Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T09:10:30.844Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}