Improper Validation of Array Index in BuildKit - CVE-2026-93321
Published: October 2, 2026
Vulnerability identifier: #VU153194
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93321
CWE-ID: CWE-129
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A local attacker can submit the LLB definition that causes buildkitd to panic and terminate, leading to denial of service condition.
Affected software
BuildKit
How to mitigate CVE-2026-93321
Install updates from vendor's website.
BuildKit - update to 0.33.1