# CVE-2026-111253: Dnf5daemon-server: dnf5: dnf5daemon-server: missing session-owner check allows foreign d-bus callers to replace another client's resolved transaction

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

A flaw was found in dnf5daemon-server. Session methods on dynamically exported D-Bus session objects do not verify that the caller is the unique sender that created the session. A local attacker can modify another user's live package-management session and replace its resolved transaction plan. If the legitimate session party later authorizes execution, the root daemon may apply the attacker-chosen package operations.

## Remediation

- workaround: Until a fixed build is available, avoid leaving interactive dnf5daemon sessions open on multi-user systems where untrusted local accounts can access the system bus, and close sessions promptly after use. (source: CNA: fedora)

## Affected products and versions

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

## Severity and prioritization

- CVSS 3.1: 6.6 (medium); CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H; source: CNA: fedora

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- 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-2026-111253 (CNA: fedora; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2553683 (CNA: fedora; issue-tracking, x_refsource_REDHAT)

- https://github.com/rpm-software-management/dnf5/commit/46a4a8ad8d34af91ec2add6bb29e487571ea6c85 (CNA: fedora)

## Provenance

- CNA: fedora: https://www.cve.org/CVERecord?id=CVE-2026-111253; retrieved 2026-11-05; source updated 2026-11-05

Revision: 028a147c8d226a5f4622cb18b4d27fe8f1d3607c7c5b80eb9ba3bb735fb1acd2

Canonical: https://y2.dev/cve/CVE-2026-111253

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