# CVE-2026-53600

## Summary

- **CVE ID:** CVE-2026-53600
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (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)
- **CWE:** CWE-20, CWE-843
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 2, 2026

## 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.

## Affected Products

- dignifiedquire — async-tar (< 0.6.1)

## References

- [CNA](https://github.com/dignifiedquire/async-tar/security/advisories/GHSA-35rm-7j9c-2f7m)
- [CNA](https://github.com/dignifiedquire/async-tar/releases/tag/v0.6.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 25.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._