Detections
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Echo: libsoup3: security update to 3.6.6-1+e12

medium Tenable Self-Hosted Container Security Plugin ID 473739

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - A flaw was found in SoupServer (libsoup). When an HTTP/1.x client sends a request with Expect:
 100-continue and a request body, and SoupServer returns an early final (non-1xx) response before the body
 is read, the server neither drains the declared body bytes nor closes the connection. On a keep-alive
 connection, those leftover bytes are interpreted as a subsequent HTTP request. A remote, unauthenticated
 attacker can place a complete HTTP request in the body and cause SoupServer to process that smuggled
 request, leading to unintended request handling. (CVE-2026-103399)

Solution

Update the libsoup3 library and its related packages to version 3.6.6-1+e12 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-103399

Plugin Details

Severity: Medium

ID: 473739

Version: Revision 1.1

Type: Local

Published: 10/8/2026

Updated: 10/8/2026

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-103399

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/1/2026

Vulnerability Publication Date: 9/30/2026

Reference Information

CVE: CVE-2026-103399