CVE-2026-57964
Description
A flaw was found in spice-vdagent. On macOS and BSD platforms, an unprivileged local user can bypass authentication by connecting to the Unix Domain Socket Client/Server (UDSCS) socket. This allows the unauthorized user to receive host-to-guest messages, including clipboard data and file transfers, inject clipboard data to the SPICE host, and prevent the legitimate agent from functioning.
Statement
Red Hat products are not affected by this CVE as the vulnerable code is not present in Red Hat's shipped versions of spice-vdagent.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | Low | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Red Hat CVSS v3 Score Explanation
macOS/BSD only — dummy-session-info.c disables all auth. Any local unprivileged user can connect and become the trusted agent. C:L for clipboard data interception, I:L for clipboard injection to host, A:L for denying SPICE services to the legitimate agent. CVSS does not capture platform scope; the LOW impact rating accounts for the fact that macOS/BSD is not shipped by Red Hat.
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability,Access Control
Technical Impact: Read Application Data; Gain Privileges or Assume Identity; Execute Unauthorized Code or Commands
This weakness can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with sensitive information or even execute arbitrary code.
Acknowledgements
Red Hat would like to thank Ashish Kunwar for reporting this issue.
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