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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.

PUBLISHED Reserved 2026-02-24 | Published 2026-03-12 | Updated 2026-03-12 | Assigner redhat




MEDIUM: 5.8CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L

Problem types

Reusing a Nonce, Key Pair in Encryption

Product status

Default status
affected

Default status
unknown

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-02-24:Reported to Red Hat.
2026-02-24:Made public.

Credits

Red Hat would like to thank Cavid for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-3099 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2442232 (RHBZ#2442232) issue-tracking

gitlab.gnome.org/GNOME/libsoup/-/issues/495

cve.org (CVE-2026-3099)

nvd.nist.gov (CVE-2026-3099)

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