{"id":"CVE-2021-21272","aliases":["GHSA-g5v4-5x39-vwhx","BIT-oras-2021-21272","GO-2021-0099"],"title":"Zip slip directory exploit in github.com/deislabs/oras","summary":"Zip slip directory exploit in github.com/deislabs/oras","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","vendor":"deislabs","product":"github.com/deislabs/oras","ecosystem":"go","affected":["github.com/deislabs/oras < 0.9.0"],"patched":["github.com/deislabs/oras 0.9.0"],"published":"2022-02-15","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-g5v4-5x39-vwhx","references":[{"url":"https://github.com/deislabs/oras/security/advisories/GHSA-g5v4-5x39-vwhx"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21272"},{"url":"https://github.com/deislabs/oras/commit/96cd90423303f1bb42bd043cb4c36085e6e91e8e"},{"url":"https://github.com/deislabs/oras"},{"url":"https://github.com/deislabs/oras/releases/tag/v0.9.0"},{"url":"https://pkg.go.dev/github.com/deislabs/oras/pkg/oras"},{"url":"https://pkg.go.dev/vuln/GO-2021-0099"}],"tags":["osv","go"],"epss":0.01448,"epssPercentile":0.71757,"ingestedAt":"2026-07-09T18:56:36.371Z","slug":"CVE-2021-21272","body":"## Overview\n\n### 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)\n\n## Affected packages\n\n- `github.com/deislabs/oras < 0.9.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/deislabs/oras 0.9.0`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.4,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}