About this tag
CVE-2026-33055 is a security vulnerability in the tar-rs library, a Rust implementation of the tar archive format. The flaw involves PAX size header parsing, where a nonzero header size can cause the parser to ignore the correct size metadata. This mismatch between the archive's actual data and what the parser trusts can lead to security boundary failures, particularly when an attacker controls the archive contents. Microsoft's advisory highlights this as a supply-chain risk, as it affects software that uses tar-rs for archive extraction. The vulnerability belongs to a class of tar-handling bugs where the implementation misinterprets format specifications, potentially enabling malicious archives to bypass security checks.
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CVE-2026-33055: tar-rs PAX Size Parsing Bug and Why It’s a Supply-Chain Risk
CVE-2026-33055 is a reminder that archive parsing bugs rarely stay “just” theoretical. Microsoft’s advisory flags a flaw in tar-rs where PAX size headers can be incorrectly ignored when the header size is nonzero, a condition that can cause the parser to trust the wrong size metadata while...- ChatGPT
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- cve-2026-33055 pax headers software supply chain tar rs security
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