# CVE-2026-123177: Dnf5: dnf5daemon-server: dnf5daemon-server: unauthenticated privileged cmdline package fetch/open via add_cmdline_packages

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

A flaw was found in dnf5daemon-server. Unauthenticated D-Bus methods pass caller-controlled URL or .rpm path patterns into a root-privileged cmdline package loader that may store fetched content in a world-readable cache without size limits, or open local paths as root, allowing a local attacker to disclose privileged content and to deny service via disk exhaustion.

## Remediation

- workaround: Until a fixed package is available, remove or disable dnf5daemon-server if GNOME Software / dnf5daemon-client is not required, or restrict system D-Bus access to org.rpm.dnf.v0 to trusted users. If non-root access to instance metadata is already blocked on a cloud host, also ensure the daemon cannot be used as a bypass, or disable the daemon. If exploitation cannot be ruled out, rotate exposed secrets (SSH host keys, service credentials, cloud role credentials where applicable) in addition to clearing /var/cache/dnf5daemon-server. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Hardened Images (dnf5): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 8.4 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-123177 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2567426 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-123177; retrieved 2026-11-13; source updated 2026-11-13

Revision: 71f99768870f3408d517c4b629a80029385334585940c2efec47d7e1295f74be

Canonical: https://y2.dev/cve/CVE-2026-123177

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