CVE-2026-33055
Description
tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of 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. This is almost the inverse of the astral-tokio-tar issue. 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. This can affect anything that uses the tar crate to parse archives and expects to have a consistent view with other parsers. This issue has been fixed in version 0.4.45.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 0.4.45-1 |
| debian | sid | fixed | 0.4.45-1 |
| debian | trixie | affected | |
References
- https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff
- https://github.com/composefs/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff
- https://nvd.nist.gov/vuln/detail/CVE-2026-33055
- https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946
- https://github.com/alexcrichton/tar-rs
- https://rustsec.org/advisories/RUSTSEC-2026-0068.html
- https://www.cve.org/CVERecord?id=CVE-2025-62518
- https://crates.io/crates/tar
- https://security-tracker.debian.org/tracker/CVE-2026-33055
- https://github.com/advisories/GHSA-gchp-q4r4-x4ff
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.