Medium 5.1Published Mar 20, 2026

CVE-2026-33055tar-rs incorrectly ignores PAX size headers if header size is nonzero

Updated under an hour ago (Oct 27, 2026, 5:40 AM ET)

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Every CVE for alexcrichton tar-rs

Exploited in the last 30 days

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: 5.1 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-843
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

alexcrichton tar-rs alexcrichton:tar_rs (from the name)	before 0.4.45	CNA record
alexcrichton tar-rs alexcrichton:tar-rs	before 0.4.45	NVD

References

References

https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff	x-refsource-confirm, exploit, vendor-advisory
https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946	x-refsource-misc, patch
https://www.cve.org/CVERecord?id=CVE-2025-62518	x-refsource-misc, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.