CVE-2026-39376

EIP tracks 1 public exploit for CVE-2026-39376. PoCs published by redyank.

AI-analyzed exploit summary This repository provides a detailed technical analysis of CVE-2026-39376, an infinite redirect loop DoS vulnerability in the `fastfeedparser` library. The vulnerability arises from unbounded recursion in the `parse()` function when processing HTML meta-refresh tags, leading to stack exhaustion and potential SSRF chaining.

FastFeedParser is a high performance RSS, Atom and RDF parser. Prior to 0.5.10, when parse() fetches a URL that returns an HTML page containing a <meta http-equiv="refresh"> tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An attacker-controlled server that returns an infinite chain of HTML meta-refresh responses causes unbounded recursion, exhausting the Python call stack and crashing the process. This vulnerability can also be chained with the companion SSRF issue to reach internal network targets after bypassing the initial URL check. This vulnerability is fixed in 0.5.10.