# CVE-2026-3099

## Summary

- **CVE ID:** CVE-2026-3099
- **Severity:** MEDIUM
- **CVSS Score:** 5.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L)
- **CWE:** CWE-323
- **Published:** Mar 12, 2026
- **Last Modified:** May 1, 2026

## 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

No affected products listed.

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-3099)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2442232)
- [CNA](https://gitlab.gnome.org/GNOME/libsoup/-/issues/495)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 28.7

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._