{"id":"CVE-2026-33055","aliases":["GHSA-gchp-q4r4-x4ff","RUSTSEC-2026-0068"],"url":"https://o3.security/vulnerability/CVE-2026-33055","summary":"tar-rs incorrectly ignores PAX size headers if header size is nonzero","details":"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.","published":"2026-03-20T07:06:08.390Z","modified":"2026-08-07T11:50:53.185829063Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"tar","fixedVersion":"0.4.45"}],"fix":{"url":"https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946","label":"alexcrichton/tar-rs@de1a587"},"references":[{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2025-62518"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33055.json"},{"type":"ADVISORY","url":"https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33055"},{"type":"FIX","url":"https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:53.185829063Z"}}