CVE-2026-39376

CVE-2026-39376 CVE-2026-39376（meta-refresh チェーンによる無限リダイレクトループ DoS） 概要 parse が タグを含む HTML ページを返す URL を取得すると、リダイレクト URL を指定して再帰的に自身を呼び出します。この際、深さ制限、訪問済み URL の重複排除、リダイレクト回数の上限は一切ありません。攻撃者が制御するサーバーが HTML meta-refresh レスポンスの無限チェーンを返すと、無制限の再帰が発生し、Python のコールスタックを枯渇させてプロセスをクラッシュさせます。この脆弱性は、付随する SSRF...

CVE-2026-39376

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 tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An...

GHSA-4GX2-PC4F-WQ37 FastFeedParser has an infinite redirect loop DoS via meta-refresh chain

Summary When parse fetches a URL that returns an HTML page containing a 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 response...

EUVD-2026-19915

FastFeedParser has an infinite redirect loop DoS via meta-refresh chain...

Uncontrolled Recursion

Overview fastfeedparser is a High performance RSS, Atom, JSON and RDF feed parser in Python Affected versions of this package are vulnerable to Uncontrolled Recursion through the parse function when processing HTML responses containing a tag, which leads to unbounded recursion without a redirect...

FastFeedParser has an infinite redirect loop DoS via meta-refresh chain

Summary When parse fetches a URL that returns an HTML page containing a 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 response...

PYSEC-2026-60

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 tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An...

CVE-2026-39376 FastFeedParser has an infinite redirect loop DoS via meta-refresh chain

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 tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An...

CVE-2026-39376: Uncontrolled Recursion

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 tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An...

FastFeedParser 安全漏洞

FastFeedParser is a high-performance Python library for parsing RSS and Atom feeds, open-sourced by Kagi Search. Versions of FastFeedParser prior to 0.5.10 contained a security vulnerability. This vulnerability stemmed from the lack of a recursive depth limit when parsing HTML meta refresh tags,...

PT-2026-31006

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 tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An...