CVE-2026-62303
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
Pistache (a C++ REST toolkit) versions 0.0.5 through 0.4.26 use std::regex_replace() with the //+ expression to collapse consecutive slashes in SegmentTreeNode::sanitizeResource(). With libstdc++, a path with tens of thousands of consecutive slashes causes deep recursion, stack exhaustion, and process crash.
Risk Assessment
An unauthenticated remote attacker can cause denial of service (process crash) if the deployment allows sufficiently long request paths, such as via increased maxRequestSize or long paths forwarded through a frontend.
Recommendation
Limit maximum request path length and consider applying the source fix that replaces recursive regex normalization with an iterative pass. Until a fix is released, monitor and block requests with excessive consecutive slashes.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS