CVE-2026-3099 — MEDIUM (5.8)

Vulnerability 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.

CVSS Score

5.8

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

LOW

Affected Products

Vendor	Product	Versions
Gnome	Libsoup	-
Redhat	Enterprise Linux	6.0

Related Weaknesses (CWE)

CWE-323

References

https://access.redhat.com/security/cve/CVE-2026-3099Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2442232Issue TrackingThird Party Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/495ExploitIssue TrackingThird Party Advisory

FAQ

What is CVE-2026-3099?

CVE-2026-3099 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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-cou...

How severe is CVE-2026-3099?

CVE-2026-3099 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-3099?

Check the references section above for vendor advisories and patch information. Affected products include: Gnome Libsoup, Redhat Enterprise Linux.