Build environment compiled into the library and readable at runtime

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

The build script of `rustpython-vm` 0.3.0 through 0.5.0 writes every environment variable of the build into `$OUT_DIR/env_vars.rs`. The crate compiles that file into `_sysconfigdata`'s `build_time_vars`. That module is always compiled. A binary built in CI with secrets in the environment carries those secrets in clear text. Registry tokens, cloud credentials and API keys are the usual ones. Anyone with the binary can read them with `strings` or from Python. Version 0.6.0 removes the dump and the include. Users of earlier versions should upgrade, rebuild, and ship new binaries. Every secret that was in the environment of a past build whose output left the build machine should be treated as exposed. Jacob Finkelman first reported the issue in [#8802](https://github.com/RustPython/RustPython/issues/8802). [Bitbison](https://registry.bitbison.io/cargo/rustpython-vm)'s automated supply chain scanning then detected credential data from the build environment flowing into artifacts that third-party software ships in the wild. The leak was confirmed in the published release binaries of at least four dependants but others have been impacted.

Source published

23 Sep 2026 12:00:00 UTC

Source modified

26 Oct 2026 14:00:05 UTC

Observed here

26 Oct 2026 14:35:44 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.