{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/24628?format=json","vulnerability_id":"VCID-qj1y-b8m1-hyfm","summary":"tar-rs `unpack_in` can chmod arbitrary directories by following symlinks\n## Summary\n\nWhen unpacking a tar archive, the `tar` crate's `unpack_dir` function uses `fs::metadata()` to check whether a path that already exists is a directory. Because `fs::metadata()` follows symbolic links, a crafted tarball containing a symlink entry followed by a directory entry with the same name causes the crate to treat the symlink target as a valid existing directory — and subsequently apply `chmod` to it. This allows an attacker to modify the permissions of arbitrary directories outside the extraction root.\n\n## Reproducer\n\nA malicious tarball contains two entries: (1) a symlink `foo` pointing to an arbitrary external directory, and (2) a directory entry `foo/.` (or just `foo`). When unpacked, `create_dir(\"foo\")` fails with `EEXIST` because the symlink is already on disk. The `fs::metadata()` check then follows the symlink, sees a directory at the target, and allows processing to continue. The directory entry's mode bits are then applied via `chmod`, which also follows the symlink — modifying the permissions of the external target directory.\n\n## Fix \n\nThe fix is very simple, we now use `fs::symlink_metadata()` in `unpack_dir`, so symlinks are detected and rejected rather than followed.\n\n## Credit\n\nThis issue was reported by @xokdvium - thank you!","aliases":[{"alias":"CVE-2026-33056"},{"alias":"GHSA-j4xf-2g29-59ph"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/1029714?format=json","purl":"pkg:apk/alpine/rust@1.78.0-r1?arch=aarch64&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.78.0-r1%3Farch=aarch64&distroversion=v3.20&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/1029715?format=json","purl":"pkg:apk/alpine/rust@1.78.0-r1?arch=armhf&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.78.0-r1%3Farch=armhf&distroversion=v3.20&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/1029717?format=json","purl":"pkg:apk/alpine/rust@1.78.0-r1?arch=ppc64le&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.78.0-r1%3Farch=ppc64le&distroversion=v3.20&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/1029718?format=json","purl":"pkg:apk/alpine/rust@1.78.0-r1?arch=riscv64&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.78.0-r1%3Farch=riscv64&distroversion=v3.20&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/1029720?format=json","purl":"pkg:apk/alpine/rust@1.78.0-r1?arch=x86&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.78.0-r1%3Farch=x86&distroversion=v3.20&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/1029716?format=json","purl":"pkg:apk/alpine/rust@1.78.0-r1?arch=armv7&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.78.0-r1%3Farch=armv7&distroversion=v3.20&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/1029719?format=json","purl":"pkg:apk/alpine/rust@1.78.0-r1?arch=s390x&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.78.0-r1%3Farch=s390x&distroversion=v3.20&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/1029721?format=json","purl":"pkg:apk/alpine/rust@1.78.0-r1?arch=x86_64&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.78.0-r1%3Farch=x86_64&distroversion=v3.20&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/506959?format=json","purl":"pkg:apk/alpine/rust@1.83.0-r1?arch=aarch64&distroversion=v3.21&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.83.0-r1%3Farch=aarch64&distroversion=v3.21&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/506961?format=json","purl":"pkg:apk/alpine/rust@1.83.0-r1?arch=armv7&distroversion=v3.21&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.83.0-r1%3Farch=armv7&distroversion=v3.21&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/506965?format=json","purl":"pkg:apk/alpine/rust@1.83.0-r1?arch=s390x&distroversion=v3.21&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.83.0-r1%3Farch=s390x&distroversion=v3.21&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/506966?format=json","purl":"pkg:apk/alpine/rust@1.83.0-r1?arch=x86&distroversion=v3.21&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.83.0-r1%3Farch=x86&distroversion=v3.21&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/506963?format=json","purl":"pkg:apk/alpine/rust@1.83.0-r1?arch=ppc64le&distroversion=v3.21&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.83.0-r1%3Farch=ppc64le&distroversion=v3.21&reponame=main"},{"url":"http://public2.vulnerablecode.io/api/packages/506962?format=json","purl":"pkg:apk/alpine/rust@1.83.0-r1?arch=loongarch64&distroversion=v3.21&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/rust@1.83.0-r1%3Farch=loongarch64&distrov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