CVE-2026-3099 MEDIUM

CVE-2026-3099: Libsoup: libsoup: authentication bypass via digest authentication replay attack

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-323
Published March 12, 2026
Last update May 1, 2026

CVSS base score

5.8/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

A flaw was found in Libsoup. The server-side digest authentication implementation in the SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and gain unauthorized access to protected resources, impersonating the legitimate user.

Key dates

02Disclosure timeline

March 12, 2026 CVE published
May 1, 2026 Record updated