CVE-2025-14523: Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)

Overview

Severity

High (CVSS 8.2)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2025-Dec

Released

2025-12-13

Last Updated

2026-03-31

EPSS Score

0.02% (percentile: 5.6%)

Affected Products (7)

Open Source Software

• azl3 libsoup 3.4.4-10 on Azure Linux 3.0
• cbl2 libsoup 3.0.4-10 on CBL Mariner 2.0

Other

• 20801-17084
• 20933-17086
• 20958-17084
• 21112-17084
• 21115-17086

Revision History

• 2025-12-13: Information published.
• 2026-01-08: Information published.
• 2026-03-03: Information published.
• 2026-03-04: Information published.
• 2026-03-31: Information published.