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.
https://www.openwall.com/lists/oss-security/2026/04/16/2
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41035.json
https://github.com/RsyncProject/rsync/releases
https://github.com/RsyncProject/rsync/issues/871
https://bugzilla.redhat.com/show_bug.cgi?id=2458898
https://access.redhat.com/security/cve/CVE-2026-41035
https://access.redhat.com/errata/RHSA-2026:29197
https://access.redhat.com/errata/RHSA-2026:28887
https://access.redhat.com/errata/RHSA-2026:26542
https://access.redhat.com/errata/RHSA-2026:25190
https://access.redhat.com/errata/RHSA-2026:25181
https://access.redhat.com/errata/RHSA-2026:25173
https://access.redhat.com/errata/RHSA-2026:25172
https://access.redhat.com/errata/RHSA-2026:25170
https://access.redhat.com/errata/RHSA-2026:25149
https://access.redhat.com/errata/RHSA-2026:25044
https://access.redhat.com/errata/RHSA-2026:23245
https://access.redhat.com/errata/RHSA-2026:23233
https://access.redhat.com/errata/RHSA-2026:20696
https://access.redhat.com/errata/RHSA-2026:20604
https://access.redhat.com/errata/RHSA-2026:20603
https://access.redhat.com/errata/RHSA-2026:20602
https://access.redhat.com/errata/RHSA-2026:20601
https://access.redhat.com/errata/RHSA-2026:19368