Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.1, BuildKit read attacker-controlled /etc/passwd and /etc/group files without an upper bound while resolving a username to a user identifier or group identifier in executor/oci/user.go and solver/llbsolver/ops/user_linux.go. A malicious base image or build could provide oversized files that exhausted memory during user resolution and caused out-of-memory termination of the buildkitd process. This issue is fixed in version 0.31.1.
The vulnerable BuildKit code paths (executor/oci and solver/llbsolver) are not vendored in buildah.
Buildah only vendors Dockerfile parsing utilities from BuildKit:
- frontend/dockerfile/command
- frontend/dockerfile/parser
- frontend/dockerfile/shell
- util/stack
These components do not include the unbounded group parsing vulnerability described in CVE-2026-61712.
Closing as NOTABUG.