What’s Vulnerable › Vulnerabilities

CVE-2026-61712: BuildKit: Possible runtime DoS via unbounded group parsing

• Severity: low (CVSS 2.3 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-770

Description

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.

Affected products

• moby BuildKit: before 0.31.1

References

• https://github.com/moby/buildkit/commit/408266e4ba254cecabedaacdad6905de4d2a75a1
• https://github.com/moby/buildkit/commit/69a3924648e485acb3faad3081e03a8554431255
• https://github.com/moby/buildkit/releases/tag/v0.31.1
• https://github.com/moby/buildkit/security/advisories/GHSA-72x6-4j93-7w86

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