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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
5.8MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 71.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not 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.

No summary for this CVE yet.

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
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Weaknesses

CWE-323

Affected Products

Red Hat Inc.
commercial·USaka Red Hat, redhat
Red Hat Enterprise Linux 10On-premOS
Operating Systems / linux-distro
gnome
oss-project·USaka glib, gnome project
libsoupLibraryLibrary
OSS Libraries / generic-library
GNOME Foundation
oss-project·USaka libsoup, gvfs, gnu image manipulation program (gimp)
libsoupMixed
OSS Libraries / generic-library
and 6 more affected products View all →

Exploitability

Official Patch Available
Workaround Available

References

https://access.redhat.com/security/cve/CVE-2026-3099
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2442232
bugzilla.redhat.com
https://gitlab.gnome.org/GNOME/libsoup/-/issues/495
gitlab.gnome.org
and 2 more references View all →

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