CVE Feed

    Dashboard / CVE / CVE-2026-91991

    CVE-2026-91991

    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-delimited data in capitalized parameters like Domain, Path, or SameSite to bypass validation and modify cookie security attributes.

    Published:Sep 15, 2026
    Last Modified:Sep 21, 2026
    EPS:Sep 15, 2026
    EPSS Score:0.00219
    CVSS Score:5.4

    Affected Products

    Vendor
    Tornadoweb
    Product
    Tornado

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-103263 (CVSS 8.2) — Tornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links …
    CVE-2026-103261 (CVSS 6.9) — Tornado before 6.5.9 fails to limit the number of query string fields in HTTPServerRequest.__init__, allowing …
    CVE-2026-103262 (CVSS 8.7) — Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient th…
    CVE-2026-91992 (CVSS 8.2) — Tornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are …
    CVE-2026-91990 (CVSS 8.7) — Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits mu…
    CVE-2024-58384 (CVSS 6.3) — Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carri…
    CVE-2023-54397 (CVSS 9) — Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Lengt…
    CVE-2024-14029 (CVSS 9) — Tornado before 6.4.1 ignores duplicate Transfer-Encoding: chunked headers, treating requests as having no mess…
    CVE-2026-82397 (CVSS 7.5) — Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses applicat…
    CVE-2026-49855 (CVSS 7.5) — Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, Tornado gzip decompress…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High