CVE-2026-49853

Description

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when a redirect changed scheme, host, or port. This issue is fixed in version 6.5.6.

PUBLISHED Reserved 2026-06-01 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Product status

References

github.com/...ornado/security/advisories/GHSA-3x9g-8vmp-wqvf

github.com/tornadoweb/tornado/pull/3626

github.com/...ommit/aba2569f7ed7a6bdbef816658fb6b7182531b751

github.com/tornadoweb/tornado/releases/tag/v6.5.6

cve.org (CVE-2026-49853)

nvd.nist.gov (CVE-2026-49853)

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