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CVE-2026-57966: Spice-vdagent: path traversal in file transfer via unsanitized filename

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-29 · updated 2026-07-08
• Weakness: CWE-22

Description

A path traversal vulnerability was found in spice-vdagent. This flaw allows a malicious or compromised SPICE host to write arbitrary files to any location on the guest operating system. This occurs because the filename provided by the SPICE host during file transfers is not properly sanitized before being used. An attacker could exploit this to write to sensitive locations with the privileges of the spice-vdagent process, typically the logged-in user. This issue requires the SPICE host to be untrusted or compromised for exploitation.

Affected products

• Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0, 10.0
• Spice-Space Spice-Vdagent: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-57966
• https://bugzilla.redhat.com/show_bug.cgi?id=2493582

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