Vulnerability Instance
Lookup for vulnerabilities affecting packages.
GET /api/vulnerabilities/24628?format=api
{ "url": "http://public2.vulnerablecode.io/api/vulnerabilities/24628?format=api", "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=api", "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=api", "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=api", "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=api", "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=api", "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=api", "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=api", "purl": 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"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=api", "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=api", "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=api", "purl": 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