Vulnerability intelligence

CVE-2026-49853

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.

CVSS Score

—

High

EPSS — Exploit Probability

0.5%

Riskier than 39% of all CVEs

Exploitation

Not in CISA KEV

No federal exploitation record

Remediation

unknown

Check vendor advisories

NVD entry

1 article across 1 outlet · first covered Jun 16, 2026 · latest Jun 16, 2026

Coverage timeline

Tornado fixes credential leak in redirect, urges immediate update
securityonline.info · Jun 16, 2026