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CVE-2026-3099 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.3 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CNA: [email protected]CVSS-B:5.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://access.redhat.com/security/cve/CVE-2026-3099	[email protected]	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2442232	[email protected]	Issue TrackingThird Party Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/495	[email protected]	ExploitIssue TrackingThird Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-323	Reusing a Nonce, Key Pair in Encryption	[email protected]

Affected Products

Product	Versions
gnome libsoup	All versions
CPE cpe:2.3:a:gnome:libsoup:-:::::::* Remediation No remediation found in references.
redhat enterprise linux	6.0 7.0 8.0 9.0 10.0
CPE cpe:2.3:o:redhat:enterprise_linux:6.0:::::::* cpe:2.3:o:redhat:enterprise_linux:7.0:::::::* cpe:2.3:o:redhat:enterprise_linux:8.0:::::::* cpe:2.3:o:redhat:enterprise_linux:9.0:::::::* cpe:2.3:o:redhat:enterprise_linux:10.0:::::::* Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Mar 23, 2026	Initial Analysis	[email protected]
Mar 12, 2026	CVE Modified	[email protected]
Mar 12, 2026	New CVE Received	[email protected]