CVE-2026-33056 — UNIX Symbolic Link (Symlink) Following in Tar-rs

CWE-61 — UNIX Symbolic Link (Symlink) FollowingCWE-59 — Link Following19 documents10 sources
Severity
5.1MEDIUMNVD
EPSS
0.0%
top 98.58%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Alexcrichton Tar-rsTAR Project TARGNU TAR
Timeline
PublishedMar 20
Latest updateApr 14

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 …

CVSS vector

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

Affected Packages3 packages

▶crates.iognu/tar0.0.0-0 — 0.4.45+1
▶NVDtar_project/tar< 0.4.45
▶CVEListV5alexcrichton/tar-rs< 0.4.45

Patches

Patch: github.com ↗

🔴Vulnerability Details

5
CVEList
tar-rs: unpack_in can chmod arbitrary directories by following symlinks↗2026-03-20
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OSV
tar-rs `unpack_in` can chmod arbitrary directories by following symlinks↗2026-03-20
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GHSA
tar-rs `unpack_in` can chmod arbitrary directories by following symlinks↗2026-03-20
▶
OSV
CVE-2026-33056: tar-rs is a tar archive reading/writing library for Rust↗2026-03-20
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OSV
`unpack_in` can chmod arbitrary directories by following symlinks↗2026-03-19
▶

📋Vendor Advisories

8
Ubuntu
tar-rs vulnerability↗2026-04-14
▶
Ubuntu
Rust vulnerability↗2026-04-14
▶
Ubuntu
Rust vulnerability↗2026-04-13
▶
Ubuntu
tar-rs vulnerability↗2026-04-01
▶
Ubuntu
cargo-c vulnerability↗2026-04-01
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-33056 Impact, Exploitability, and Mitigation Steps | Wiz↗
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💬Community

3
Bugzilla
CVE-2026-33056 rust: tar-rs: Arbitrary directory permission modification via crafted tar archive [fedora-all]↗2026-03-20
▶
Bugzilla
CVE-2026-33056 goose: tar-rs: Arbitrary directory permission modification via crafted tar archive [fedora-all]↗2026-03-20
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Bugzilla
CVE-2026-33056 fido-device-onboard: tar-rs: Arbitrary directory permission modification via crafted tar archive [fedora-all]↗2026-03-20
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CVE-2026-33056 — UNIX Symbolic Link (Symlink) Following | cvebase