Disclosure summary
In rsync 3.0.1 through 3.4.1, receive_xattr relies on an untrusted length value during a qsort call, leading to a receiver use-after-free. The victim must run rsync with -X (aka --xattrs). On Linux, many (but not all) common configurations are vulnerable. Non-Linux platforms are more widely vulnerable.
Source-reported weakness categories
CWE-130
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2026-Apr
Open original source · Updated Sep 24, 2026
In rsync 3.0.1 through 3.4.1, receive_xattr relies on an untrusted length value during a qsort call, leading to a receiver use-after-free. The victim must run rsync with -X (aka --xattrs). On Linux, many (but not all) common configurations are vulnerable. Non-Linux platforms are more widely vulnerable.
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 7.4
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 rsync 3.4.1-2 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 rsync 3.4.1-2 on CBL Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 rsync 3.4.1-2 on CBL-Mariner 2.0 | (MSRC status code 3) |
Vendor remediation references
- CBL-Mariner Releases · build 3.4.3-1 · product IDs 20732-17084
- Vendor guidance · product IDs 20732-17084
- Release Notes · product IDs 20706-21692
- Vendor guidance · product IDs 20706-21692
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-04-16T21:02:04-04:00
MODIFIED 2026-09-24T21:51:13-04:00
INGESTED 2026-10-08T12:45:03-04:00