Improper Validation of Array Index Affecting github.com/moby/buildkit/solver/llbsolver/ops package, versions <0.33.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMOBYBUILDKITSOLVERLLBSOLVEROPS-20826474
- published11 Oct 2026
- disclosed5 Oct 2026
- creditYanhaoxi
Introduced: 5 Oct 2026
NewCVE-2026-93322 Â (opens in a new tab)How to fix?
Upgrade github.com/moby/buildkit/solver/llbsolver/ops to version 0.33.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Array Index due to missing MergeOp input-count validation in the solver/llbsolver/ops merge processing path. An attacker can crash buildkitd by supplying a crafted LLB definition with a malformed MergeOp whose inner inputs do not match the enclosing vertex input count, triggering a panic during cache map scheduling. This affects builds handled by the daemon for untrusted external frontends: a malicious frontend can send the malformed graph and terminate all builds served by that buildkitd instance.
Workarounds
- Avoid using external BuildKit frontends from untrusted sources; this prevents a malicious frontend from submitting a crafted LLB
MergeOpthat can crashbuildkitd. - Use Dockerfile builds instead of external frontends; Dockerfile builds are unaffected by this issue and avoid the malformed
MergeOpattack path.