Reusing a Nonce Affecting libsoup3 package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.36% (28th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-DEBIAN12-LIBSOUP3-15351503
  • published25 Feb 2026
  • disclosed12 Mar 2026

Introduced: 25 Feb 2026

CVE-2026-3099  (opens in a new tab)
CWE-323  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 libsoup3.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libsoup3 package and not the libsoup3 package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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 Base Scores

version 3.1