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

Quick assessment

Affected
alexcrichton tar-rs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

tar-rs是Alex Crichton个人开发者的一个Rust语言的tar归档文件读写库。 tar-rs 0.4.44及之前版本存在安全漏洞，该漏洞源于PAX大小头处理逻辑不一致，可能导致不同解析器解压结果不一致。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1063
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I. Basic Information for CVE-2026-33055

Vulnerability Information
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Vulnerability Title
tar-rs incorrectly ignores PAX size headers if header size is nonzero
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5
Vulnerability Title
tar-rs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tar-rs是Alex Crichton个人开发者的一个Rust语言的tar归档文件读写库。 tar-rs 0.4.44及之前版本存在安全漏洞，该漏洞源于PAX大小头处理逻辑不一致，可能导致不同解析器解压结果不一致。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
alexcrichton tar-rs < 0.4.45 -

II. Public POCs for CVE-2026-33055

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III. Intelligence Information for CVE-2026-33055

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Patches & Fixes for CVE-2026-33055 (1)

Vendor Advisories for CVE-2026-33055 (2)

IV. Related Vulnerabilities

Same product: tar-rs
Same vendor: alexcrichton
Same weakness: CWE-843

V. Comments for CVE-2026-33055

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