CVE-2026-103399: Libsoup: soupserver: http/1 request smuggling via undrained expect: 100-continue body

Overview

Severity

Medium (CVSS 5.3)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-10-03

Last Updated

2026-10-05

EPSS Score

0.24% (percentile: 14.3%)

Affected Products (1)

Other

• 21478-17084

Revision History

• 2026-10-03: Information published.
• 2026-10-05: Information published.