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CVE-2026-41035 is a receiver-side use-after-free vulnerability in rsync’s extended attribute handling, affecting rsync versions 3.0.1 through 3.4.1. The flaw is in the receive_xattr function, where rsync reads an extended-attribute count from the wire protocol and later sorts entries with qsort using that untrusted original count rather than the number of attributes actually accepted after filtering and namespace handling. When some received attributes are discarded, the sort can operate on stale or uninitialized array entries, allowing previously freed heap-backed structures to be reintroduced into the active list. This can lead to read-after-free and double-free conditions during later checksum comparison, name-copying, cleanup, or attribute-writing operations. The issue is triggered only when the receiver is run with extended attribute support enabled via -X or --xattrs. Exposure depends on platform and configuration: Linux is vulnerable in many filtered or --fake-super scenarios, while FreeBSD and macOS receivers using extended attributes are more broadly exposed.
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A related rsync use-after-free vulnerability affecting versions 3.0.1 through 3.4.1, mentioned for security history/context.
A use-after-free memory corruption vulnerability in rsync's extended attribute handling, triggered when a malicious sender supplies a higher xattr count than the number of attributes actually accepted, causing qsort to process stale entries and enabling crashes, information disclosure, and heap corruption.
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Cross-references every affected SKU, including bundled OEM variants.
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