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Moderate severityNVD Advisory· Published Mar 20, 2026· Updated Mar 20, 2026

tar-rs: unpack_in can chmod arbitrary directories by following symlinks

CVE-2026-33056

Description

tar-rs is a tar archive reading/writing library for Rust. In versions 0.4.44 and below, when 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. This issue has been fixed in version 0.4.45.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
tarcrates.io
< 0.4.450.4.45

Affected products

28

Patches

Vulnerability mechanics

References

5

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