Vulnerability record · CVE-2026-3099 · published 12 March 2026

CVE-2026-3099: Gnome libsoup vulnerability

Gnome · Libsoup

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.

7.3 CVSS 3.1 High EPSS 0.48% · top 60.9% CWE-323 · CWE-323

7.3CVSS 3.1 base score

0.48%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

3References, 1 tagged exploit

17 Jun 2026Last modified by NVD

Description

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Libsoup Gnome

Enterprise Linux Redhat

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-3099), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.