Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity improper input validation in buildkit from moby. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.4%top 70.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/moby/buildkit	0.31.1	GHSA-7236-3392-c5c6
Go	github.com/moby/buildkit	0.31.1	GO-2026-6255

Affected products (as reported)

Vendor	Product	Versions
moby	buildkit	< 0.31.1

Weakness: CWE-20 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

References

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