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CVE-2026-33055

Alexcrichton Tar-rs type confusion

8.1 HIGHPublic exploitEPSS 0.48%
  1. Published20 Mar 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

Alexcrichton Tar-rs< 0.4.45

Remediation

Fixed in
Alexcrichton Tar-rs≥ 0.4.45

References

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Frequently asked

Is CVE-2026-33055 being actively exploited?

CVE-2026-33055 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.48%.

How severe is CVE-2026-33055?

CVE-2026-33055 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.48% probability of exploitation.

Which products are affected by CVE-2026-33055?

Affected products include Alexcrichton Tar-rs.

How do I fix CVE-2026-33055?

Upgrade affected software to a fixed version, for example Alexcrichton Tar-rs 0.4.45 or later, then confirm no affected versions remain in your inventory.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.