What’s Vulnerable › Vulnerabilities

CVE-2026-61711: BuildKit: Custom frontend could bypass Seccomp/AppArmor

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-09-09
• Weakness: CWE-20

Description

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.1, a custom frontend could place an invalid SecurityMode value in a crafted build request, and executor/oci/spec_linux.go treated the unsupported value as a non-sandbox mode without requiring the security.insecure entitlement. This disabled Seccomp and AppArmor protections for the build container even though Linux capabilities remained restricted. This issue is fixed in version 0.31.1.

Affected products

• moby BuildKit: before 0.31.1

References

• https://github.com/moby/buildkit/commit/3ea6dd0ce7d269cdb8aa23348718e2c1bf64f109
• https://github.com/moby/buildkit/commit/64bbec89ca43dd95b2853edeca240c33c6729910
• https://github.com/moby/buildkit/releases/tag/v0.31.1
• https://github.com/moby/buildkit/security/advisories/GHSA-7236-3392-c5c6

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