CVE WatchSep 17, 2026

CVE-2026-85078

Sanic is an opensource python web server/framework. In version 25.12.0, Sanic's core HTTP/1.1 chunked-body handling does not fully consume t

CVSS

6.5

Medium

EPSS

0.3%

p23

KEV

—

Exploit Today

0-100

Published: Sep 17, 2026 · Last modified: Sep 17, 2026 · CWE-444

EPSS · 30d

Not enough EPSS history yet.

Technical description

Sanic is an opensource python web server/framework. In version 25.12.0, Sanic's core HTTP/1.1 chunked-body handling does not fully consume the trailer-part after the terminating zero chunk before reusing the keep-alive connection buffer. A remote unauthenticated client can place attacker-controlled bytes in that trailer region, causing Sanic to parse and route them as a hidden second request after the outer request. This breaks HTTP request-boundary integrity and can provide a request-smuggling primitive when Sanic is deployed behind intermediaries. This issue is fixed in version 25.12.1.

Official references

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