Vulnerability intelligence

CVE-2026-49855

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, Tornado gzip decompression routines processed limited-size chunks but did not enforce an overall limit on accumulated decompressed chunks, allowing a malicious server accessed by SimpleAsyncHTTPClient or an HTTPServer configured with decompress_request=True to consume effectively unlimited memory. This issue is fixed in version 6.5.6.

CVSS Score

—

High

EPSS — Exploit Probability

0.6%

Riskier than 44% 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