CVE-2026-33056
`unpack_in` can chmod arbitrary directories by following symlinks
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.
How to fix CVE-2026-33056
To remediate CVE-2026-33056, upgrade the affected package to a fixed version below.
- —upgrade to 1.78.0-r1 or later
- —upgrade to 0.4.45 or later
- —upgrade to 0.4.45 or later
- —no fix listed
- —no fix listed
Is CVE-2026-33056 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 1.78.0-r1
- from 0, < 0.4.45
- >= 0.0.0-0, < 0.4.45
- from 0
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |