{"id":"CVE-2021-21272","aliases":["BIT-oras-2021-21272","GHSA-g5v4-5x39-vwhx","GO-2021-0099"],"url":"https://o3.security/vulnerability/CVE-2021-21272","summary":"Zip slip directory exploit in github.com/deislabs/oras","details":"### Impact\nThe directory support (#55) allows the downloaded gzipped tarballs to be automatically extracted to the user-specified directory where the tarball can have symbolic links and hard links.\n\nA well-crafted tarball or tarballs allow malicious artifact providers linking, writing, or overwriting specific files on the host filesystem outside of the user-specified directory unexpectedly with the same permissions as the user who runs `oras pull`. \n\nPrecisely, the following users of the affected versions are impacted\n- `oras` CLI users who runs `oras pull`.\n- Go programs, which invokes `github.com/deislabs/oras/pkg/content.FileStore`.\n\n### Patches\nThe problem has been patched by the PR linked with this advisory. Users should upgrade their `oras` CLI and packages to `0.9.0`.\n\n### Workarounds\nFor `oras` CLI users, there is no workarounds other than pulling from a trusted artifact provider.\n\nFor `oras` package users, the workaround is to not use `github.com/deislabs/oras/pkg/content.FileStore`, and use other content stores instead, or pull from a trusted artifact provider.\n\n### References\n- [Zip Slip](https://github.com/snyk/zip-slip-vulnerability)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue on the [GitHub repo](https://github.com/deislabs/oras)\n* Email the [list of maintainers](https://github.com/deislabs/oras/blob/main/MAINTAINERS)","published":"2021-01-25T19:15:12.847Z","modified":"2026-08-27T08:14:52.550308Z","cvss":{"score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/deislabs/oras","fixedVersion":"0.9.0"}],"fix":{"url":"https://github.com/deislabs/oras/commit/96cd90423303f1bb42bd043cb4c36085e6e91e8e","label":"deislabs/oras@96cd904"},"references":[{"type":"ADVISORY","url":"https://github.com/deislabs/oras/releases/tag/v0.9.0"},{"type":"ADVISORY","url":"https://pkg.go.dev/github.com/deislabs/oras/pkg/oras"},{"type":"FIX","url":"https://github.com/deislabs/oras/commit/96cd90423303f1bb42bd043cb4c36085e6e91e8e"},{"type":"FIX","url":"https://github.com/deislabs/oras/security/advisories/GHSA-g5v4-5x39-vwhx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21272"},{"type":"PACKAGE","url":"https://github.com/deislabs/oras"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2021-0099"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T08:14:52.550308Z"}}