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OpenAdvisories
Medium · 5.8 CVE-2026-3099 EUVD-2026-11573GHSA-hrf3-6c7v-5628

Libsoup: libsoup: authentication bypass via digest authentication replay attack

Published Mar 12, 2026 · Updated Nov 5, 2026 · Assigned by redhat

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.

Affected products

VendorProductAffectedFixed
Red Hat Red Hat Enterprise Linux 10 — —
Red Hat Red Hat Enterprise Linux 6 — —
Red Hat Red Hat Enterprise Linux 7 — —
Red Hat Red Hat Enterprise Linux 8 — —
Red Hat Red Hat Enterprise Linux 9 — —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 13 libsoup3 +1 No fix yet —
Debian 12 libsoup3 +1 No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 libsoup3 +1 No fix yet —
Ubuntu 26.04 LTS libsoup3 No fix yet —
Ubuntu 25.10 libsoup3 +1 No fix yet —
Ubuntu 24.04 LTS libsoup3 +1 No fix yet —
Ubuntu 22.04 LTS libsoup2.4 No fix yet —
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 26.04 LTS libsoup2.4 No fix yet —
Ubuntu Pro 22.04 LTS libsoup3 No fix yet —
Ubuntu Pro 20.04 LTS libsoup2.4 No fix yet —
Ubuntu Pro 18.04 LTS libsoup2.4 No fix yet —
Ubuntu Pro 16.04 LTS libsoup2.4 No fix yet —
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed libsoup 3.8.1-1.1 openSUSE-SU-2026:12365-1

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 libsoup No fix yet —

Advisories 1

References