tornado vulnerabilities
CVEs whose affected-version data names the tornado package (pip). Each record lists the affected and patched versions; check a specific version with the dependency checker or POST /api/sbom.
28 CVEsRSS
CVE-2026-116577Medium· 5.3Tornado: Quadratic CPU usage when parsing HTTP headers with line folding
Tornado: Quadratic CPU usage when parsing HTTP headers with line folding
CVE-2026-116578Low· 2.1Tornado: Open redirect in RedirectHandler via protocol-relative URLs
Tornado: Open redirect in RedirectHandler via protocol-relative URLs
CVE-2026-115927Medium· 5.3Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunks
Tornado is a Python web framework and asynchronous networking library. Prior to 6.6.0, Tornado decodes HTTP/1.1 chunked transfer encoding by processing body data that has already arrived without yielding to the event loop. A remote unaut…
CVE-2026-103263Medium· 5.9PoCTornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links inside the static root without confirming the resolved target stays within it
Tornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links inside the static root without confirming the resolved target stays within it. When a symlink pointing outside the static direc…
CVE-2026-103262High· 7.5PoCTornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed response
Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed response. Attackers can send a gzip-encoded decom…
CVE-2026-103261Medium· 5.3Tornado before 6.5.9 fails to limit the number of query string fields in HTTPServerRequest.__init__, allowing remote attackers to cause event-loop stalling by sending requests with thousands of query parameters
Tornado before 6.5.9 fails to limit the number of query string fields in HTTPServerRequest.__init__, allowing remote attackers to cause event-loop stalling by sending requests with thousands of query parameters. Attackers can send unauth…
GHSA-c2m8-h5v5-343rHighTornado: StaticFileHandler follows symlinks outside static root (path traversal)
Tornado: StaticFileHandler follows symlinks outside static root (path traversal)
GHSA-chx6-46f5-w4vpHigh· 7.5tornado: CurlAsyncHTTPClient enforces no response-size limit — decompression bomb drives unbounded memory accumulation to OOM
tornado: CurlAsyncHTTPClient enforces no response-size limit — decompression bomb drives unbounded memory accumulation to OOM
GHSA-3hv7-mjh2-fv65Medium· 5.3Tornado: Unbounded query-string argument count allows event-loop-stalling DoS
Tornado: Unbounded query-string argument count allows event-loop-stalling DoS
CVE-2024-58384Medium· 5.4Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers
Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitr…
CVE-2024-14029High· 7.5PoC⚖ disputedTornado before 6.4.1 ignores duplicate Transfer-Encoding: chunked headers, treating requests as having no message body and parsing the chunked body as a subsequent request
Tornado before 6.4.1 ignores duplicate Transfer-Encoding: chunked headers, treating requests as having no message body and parsing the chunked body as a subsequent request. Attackers can exploit this inconsistency when Tornado is deploye…
CVE-2023-54397High· 7.5Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Length headers accepting non-standard characters
Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Length headers accepting non-standard characters. Attackers can send crafted HTTP requests with these characters to bypass proxy val…
CVE-2026-91990High· 7.5PoCTornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit
Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create lar…
CVE-2026-91992Medium· 5.9PoCTornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing
Tornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through th…
CVE-2026-91991Medium· 5.4PoCTornado before 6.5.8 contains an incomplete fix for cookie attribute injection that allows attackers to inject arbitrary cookie attributes by passing capitalized or legacy keyword arguments to set_cookie
Tornado before 6.5.8 contains an incomplete fix for cookie attribute injection that allows attackers to inject arbitrary cookie attributes by passing capitalized or legacy keyword arguments to set_cookie. Attackers can embed semicolon-de…
GHSA-wwv5-g3v4-889xLowTornado: Incomplete fix for CVE-2026-35536: cookie attribute injection re-opened via the legacy case-insensitive `**kwargs` path in `set_…
Tornado: Incomplete fix for CVE-2026-35536: cookie attribute injection re-opened via the legacy case-insensitive `**kwargs` path in `set_cookie`
GHSA-8423-8fgw-73vqMediumtornado: multipart split() creates huge temp list before max_parts check -> memory amplification DoS (httputil.py:34)
tornado: multipart split() creates huge temp list before max_parts check -> memory amplification DoS (httputil.py:34)
CVE-2026-82397High· 7.5Tornado is a Python web framework and asynchronous networking library
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without passing max_num_fields. Reques…
GHSA-pw6j-qg29-8w7fMedium· 5.9Tornado: CurlAsyncHTTPClient leaks per-request credentials on handle reuse
Tornado: CurlAsyncHTTPClient leaks per-request credentials on handle reuse
CVE-2026-49854Low· 3.7Tornado has out-of-bounds memory access via C extension
Tornado has out-of-bounds memory access via C extension
CVE-2026-31958High· 7.5⚖ disputedTornado is a Python web framework and asynchronous networking library
Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs…
CVE-2025-67726High· 7.5⚖ disputedTornado is a Python web framework and asynchronous networking library
Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.…
CVE-2025-67725High· 7.5⚖ disputedTornado is a Python web framework and asynchronous networking library
Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, a single maliciously crafted HTTP request can block the server's event loop for an extended period, caused by the HTTPHeaders.add method.…
CVE-2025-67724Medium· 5.4Tornado is a Python web framework and asynchronous networking library
Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, the supplied reason phrase is used unescaped in HTTP headers (where it could be used for header injection) or in HTML in the default erro…
CVE-2025-47287High· 7.5Tornado vulnerable to excessive logging caused by malformed multipart form data
Tornado vulnerable to excessive logging caused by malformed multipart form data
CVE-2024-52804High· 7.5Tornado has an HTTP cookie parsing DoS vulnerability
Tornado has an HTTP cookie parsing DoS vulnerability
GHSA-w235-7p84-xx57Medium· 6.5Tornado has a CRLF injection in CurlAsyncHTTPClient headers
Tornado has a CRLF injection in CurlAsyncHTTPClient headers
GHSA-753j-mpmx-qq6gMedium· 5.3Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in tornado
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in tornado