Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-93353

CVE-2026-93353LOW

9001 copyparty — copyparty SFTP Volume Restriction Bypass via mkdir/rmdir/chattr Handlers

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   H   N   L   N   N   L   N    2.3   .0027   17.9     —

AFFECTED
  Product    Versions     Fixed
  copyparty  unspecified  —

TIMELINE
  Sep 17  Reserved by VulnCheck
  Sep 24  Published (CNA: VulnCheck)
  Sep 25  EXPLOIT PUBLISHED — CVE-2026-93353 (9001 copyparty). Public exploit reference added.
  Sep 28  DISPUTED — CVE-2026-93353 (9001 copyparty). Record marked disputed.
  Sep 28  EXPLOIT PUBLISHED — CVE-2026-93353 (9001 copyparty). Public exploit reference added.
  Sep 30  EXPLOIT PUBLISHED — CVE-2026-93353 (9001 copyparty). Public exploit reference added.
  Sep 30  RESCORED — CVE-2026-93353 (9001 copyparty). CVSS 6 → 2.3 (NVD).
  Oct 1   EXPLOIT PUBLISHED — CVE-2026-93353 (9001 copyparty). Public exploit reference added.

CWE-59, CWE-424 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Deferred

Description

copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundaries by exploiting three handlers that bypass the xvol volflag enforcement. The _mkdir, _rmdir, and _chattr handlers construct destination paths using vfs.get(), vn.canonical(), and os.path.join() without invoking the chk_ap access check, enabling attackers to traverse symlinks leaving a volume's top directory and perform unauthorized file creation, deletion, or truncation via SSH_FXP_SETSTAT operations on paths outside any volume the account is authorized to access.

Lifecycle

Complete event history — 8 events, chronological
Date	Event	Detail
September 17, 2026	Reserved	Reserved by VulnCheck
September 24, 2026	Published	Published (CNA: VulnCheck)
September 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-93353 (9001 copyparty). Public exploit reference added.
September 28, 2026	DISPUTED	DISPUTED — CVE-2026-93353 (9001 copyparty). Record marked disputed.
September 28, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-93353 (9001 copyparty). Public exploit reference added.
September 30, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-93353 (9001 copyparty). Public exploit reference added.
September 30, 2026	RESCORED	RESCORED — CVE-2026-93353 (9001 copyparty). CVSS 6 → 2.3 (NVD).
October 1, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-93353 (9001 copyparty). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
9001	copyparty	PyPI	—	—

Weaknesses

CWE-59 · CWE-424

References (2)

https://euriconicacio.github.io/blog/cve-2026-93353-a-volume-guard-enforced-one-call-site-at-a-time/ [technical-description, exploit]
https://www.vulncheck.com/advisories/copyparty-sftp-volume-restriction-bypass-via-mkdir-rmdir-chattr-handlers [third-party-advisory]

Authoritative record: CVE-2026-93353 at cve.org

Vendors: 9001

Weaknesses: CWE-59 · CWE-424

Ecosystems: PyPI

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-93353 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.