# CVE-2026-57965: Spice-vdagent: integer overflow in udscs_write() leading to heap buffer overflow

Status: published. Published: 2026-06-29. Updated: 2026-11-05.

A flaw was found in spice-vdagent. A malicious or compromised SPICE host can trigger an integer overflow by sending a specially crafted message. This vulnerability can lead to a heap buffer overflow, causing the spice-vdagent daemon to crash and resulting in a Denial of Service (DoS) for the virtual machine. This issue requires the SPICE host to be untrusted or compromised for exploitation.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (spice-vdagent): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (spice-vdagent): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (spice-vdagent): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (mingw-spice-vdagent): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (spice-vdagent): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (spice-vdagent): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.1 (medium); CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.11% as of 2026-11-05; percentile 1.44%

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

- Weaknesses: CWE-190

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2026-57965 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2493581 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-57965; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-57965; retrieved 2026-11-05; source updated Not reported

Revision: c66a395c2a4b9c1e841e5e3f6daf0407a233d46e491e48a8b33a25a171c50580

Canonical: https://y2.dev/cve/CVE-2026-57965

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