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CVE-2026-49853 Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

🗓️ 14 Jul 2026 20:41:32Reported by GitHub_MType 
cvelist
 cvelist🔗 www.cve.org👁 6 Views

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...

Related
Affected
Refs
ReporterTitlePublishedViews
Family
Chainguard		CVE-2026-49853 vulnerabilities
25 Jun 202620:37
–cgr
CVE		CVE-2026-49853
14 Jul 202620:41
–cve
Github Security Blog		Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient
15 Jun 202620:20
–github
NVD		CVE-2026-49853
14 Jul 202621:17
–nvd
Tenable Nessus		openSUSE 16 Security Update : python-tornado6 (openSUSE-SU-2026:21067-1)
1 Jul 202600:00
–nessus
Tenable Nessus		Python Library Tornado < 6.5.6 Multiple Vulnerabilities
19 Jun 202600:00
–nessus
Tenable Nessus		SUSE SLES16 Security Update : python-tornado6 (SUSE-SU-2026:22373-1)
2 Jul 202600:00
–nessus
Tenable Nessus		SUSE SLED15 / SLES15 Security Update : python-tornado6 (SUSE-SU-2026:2725-1)
3 Jul 202600:00
–nessus
Tenable Nessus		SUSE SLED15 / SLES15 Security Update : python-tornado (SUSE-SU-2026:2726-1)
3 Jul 202600:00
–nessus
OPENSUSE Linux		python311-tornado6-6.5.7-1.1 on GA media (moderate)
15 Jun 202600:00
–opensuse
Rows per page
[
  {
    "vendor": "tornadoweb",
    "product": "tornado",
    "versions": [
      {
        "version": "< 6.5.6",
        "status": "affected"
      }
    ]
  }
]

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14 Jul 2026 20:41Current
CVSS 3.17.7
EPSS0.00034
CWE-200
6