{"id":"CVE-2026-53600","summary":"async-tar PAX extension-header desync enables tar entry/content smuggling","details":"async-tar is a tar archive reading/writing library for async Rust. Prior to version 0.6.1, async-tar mis-applies a buffered PAX size extension to an intermediary extension header (a GNU longname L, a GNU longlink K, or a PAX x/g header) instead of to the next file entry. POSIX requires a PAX extended-header record set to describe the next file entry, never an intervening extension header. Because poll_next_raw (src/archive.rs) threads the buffered PAX records into the size computation of whatever raw header it reads next — and that header can be an intermediary L — the stream cursor is advanced by an attacker-chosen amount when the L body is consumed. The parser then desyncs relative to a POSIX-correct tar parser (e.g. GNU tar), reading subsequent bytes at the wrong block boundary. This issue has been patched in version 0.6.1.","aliases":["GHSA-35rm-7j9c-2f7m"],"modified":"2026-09-11T03:48:26.723139435Z","published":"2026-09-02T16:10:27.461Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-20","CWE-843"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53600.json"},"references":[{"type":"WEB","url":"https://github.com/dignifiedquire/async-tar/releases/tag/v0.6.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53600.json"},{"type":"ADVISORY","url":"https://github.com/dignifiedquire/async-tar/security/advisories/GHSA-35rm-7j9c-2f7m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53600"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dignifiedquire/async-tar","events":[{"introduced":"0"},{"fixed":"438d42f7aed02c53524cf7b5562631cba1cbc798"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.6.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v0.6.0","v0.5.1","v0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.0","v0.2.0","v0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53600.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}