Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Alexcrichton | Tar-Rs | < 0.4.45 |
Related Weaknesses (CWE)
References
- https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21Patch
- https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ffExploitVendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2025-62518Third Party Advisory
FAQ
What is CVE-2026-33055?
CVE-2026-33055 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-33055?
CVE-2026-33055 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33055?
Check the references section above for vendor advisories and patch information. Affected products include: Alexcrichton Tar-Rs.