Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

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

Low 2.3

In plain English

A low-severity resource allocation without limits 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 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.3Low

Exploit odds (30 days)0.4%top 65.7% 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, 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/moby/buildkit	0.31.1	GHSA-72x6-4j93-7w86
Go	github.com/moby/buildkit	0.31.1	GO-2026-6256

Affected products (as reported)

Vendor	Product	Versions
moby	buildkit	< 0.31.1

Weakness: CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

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