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CVE-2026-3099

Libsoup: libsoup: authentication bypass via digest authentication replay attack

Published: Mar 12, 2026Updated: Mar 23, 2026 Sources: CVE List NVD BDUCWE-323
NVD MITRE
5.8CVSSMEDIUM
EPSS Score
0.4%
Top 72.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:NUI:RS:CC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-323

Affected Products

Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
libsoupGNOME Foundation
Mixed
OSS Libraries / generic-library
Red Hat Enterprise Linux 10Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 6Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 7Red Hat
On-premOS
Operating Systems / linux-distro
red hat inc.commercialUSOperating Systemsaka red hat
gnome foundationoss-projectUSOSS Librariesaka libsoup, gnu image manipulation program (gimp), gvfs
red hatcommercialUSOperating Systemsaka red hat
and 4 more affected products View all →

Exploitability

Official Patch Available
Workaround Available

References

https://gitlab.gnome.org/GNOME/libsoup/-/issues/495
gitlab.gnome.org
https://access.redhat.com/security/cve/cve-2026-3099
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-3099
access.redhat.com
and 2 more references View all →

Timeline

Published
Mar 12, 2026
Last Updated
Mar 23, 2026

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