CVE-2026-27140 — Code execution vulnerability in SWIG code generation in cmd/go

Affected: Go toolchain cmd/go, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Telecommunications Update Service, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, Red Hat Enterprise Linux 8.8 Telecommunications Update Service and 16 more

SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to trust layer bypass.

GHSA-hr2v-4r36-88hr — Helm Chart extraction output directory collapse via `Chart.yaml` name dot-segment

Affected: Go: helm.sh/helm/v4, Go: helm.sh/helm/v3

Helm is a package manager for Charts for Kubernetes. In Helm versions <=3.20.1 and <=4.1.3, a specially crafted Chart will cause `helm pull --untar [chart URL | repo/chartname]` to write the Chart's contents to the immediate output directory (as defaulted to the current working directory; or as given by the `--destination` and `--untardir` flags), rather than the expected output directory suffixed by the chart's name.

### Impact

The bug enables writing the Chart's contents (unpackaged/untar'ed) to the output directory `<output dir>/`, instead of the expected `<output dir>/<chart name>/`, potentially overwriting the contents of the targeted directory.

Note: a chart name containing POSIX dot-dot, or dot-dot and slashes (as if to refer to parent directories) do not resolve beyond the output directory as designed.

### Patches

This issue has been resolved in Helm v3.20.2 and v4.1.3

A Chart with an unexpected name (those specified to be "." or ".."), or a Chart name which results in a non-unique directory will be rejected.

### Workarounds

Ensure the the name of the Chart does not comprise/contain POSIX pathname special directory references ie. dot-dot ("..") or dot ("."). In addition, ensuring that the `pull --untar` flag (or equivalent SDK option) refers to a unique/empty output directory prevents chart extraction from inadvertently overwriting existing files within the specified directory.

### Credits

Oleh Konko @1seal

Most recent entries from all

CVE-2026-27140 — Code execution vulnerability in SWIG code generation in cmd/go

GHSA-hr2v-4r36-88hr — Helm Chart extraction output directory collapse via `Chart.yaml` name dot-segment