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CVE-2026-53600— async-tar PAX extension-header desync enables tar entry/content smuggling

Quick assessment

Affected
dignifiedquire async-tar
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.

是一个用于在 Rust 中异步读写 tar 归档文件的库。在 0.6.1 版本之前， 错误地将缓冲的 PAX 大小扩展应用到了中间扩展头（例如 GNU longname 、GNU longlink 或 PAX / 头），而不是应用到下一个文件条目。根据 POSIX 规范，PAX 扩展头记录集应描述下一个文件条目，绝不应应用于中间的扩展头。由于 （位于 ）将缓冲的 PAX 记录传递至其后读取的任意原始头的大小计算中——而该头可以是中间的 ——因此在消费 主体时，流游标会被攻击者选定的量推进。这导致解析器相对于符合 P

CVSS 6.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-53600

Vulnerability Information
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Vulnerability Title
async-tar PAX extension-header desync enables tar entry/content smuggling
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
dignifiedquire async-tar < 0.6.1 -

II. Public POCs for CVE-2026-53600

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III. Intelligence Information for CVE-2026-53600

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Vendor Advisories for CVE-2026-53600 (1)

Vendor Pages for CVE-2026-53600 (1)

IV. Related Vulnerabilities

Same weakness: CWE-20

V. Comments for CVE-2026-53600

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