Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files()
CVE-2026-43620 is fixed in 4 products on 1 platform, first by rsync 3.1.2-2.1ubuntu1.6+esm3, released May 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in recv_files() in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting CF_INC_RECURSE in compatibility flags and sending a specially crafted file list where the first sorted entry is not the leading dot directory, followed by a transfer record with ndx=0 and an iflag word without ITEM_TRANSFER, causing the receiver to read 8 bytes before the allocated pointer array and dereference an invalid pointer at an unmapped address, resulting in a deterministic SIGSEGV crash of the rsync client.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rsync · Debian 12.15 (bookworm) | 3.2.7-1+deb12u5 | DEBIAN-CVE-2026-43620 | May 27, 2026 |
| rsync · Debian 13.5 (trixie) | 3.4.1+ds1-5+deb13u3 | DEBIAN-CVE-2026-43620 | May 27, 2026 |
| rsync · Debian 14 | 3.4.3+ds1-1 | DEBIAN-CVE-2026-43620 | May 27, 2026 |
| rsync · Ubuntu 18.04.6 LTS (bionic) | 3.1.2-2.1ubuntu1.6+esm3 | rsync 3.1.2-2.1ubuntu1.6+esm3 | May 19, 2026 |
| rsync · Ubuntu 20.04 LTS (focal) | 3.1.3-8ubuntu0.9+esm1 | rsync 3.1.3-8ubuntu0.9+esm1 | May 19, 2026 |
| rsync · Ubuntu 22.04.1 LTS (jammy) | 3.2.7-0ubuntu0.22.04.6 | rsync 3.2.7-0ubuntu0.22.04.6 | May 27, 2026 |
| rsync · Ubuntu 24.04.5 LTS (noble) | 3.2.7-1ubuntu1.4 | rsync 3.2.7-1ubuntu1.4 | May 27, 2026 |
| rsync · Ubuntu 25.10 (questing) | 3.4.1+ds1-5ubuntu1.2 | rsync 3.4.1+ds1-5ubuntu1.2 | May 27, 2026 |
| rsync · Ubuntu 26.04.1 LTS (resolute) | 3.4.1+ds1-7ubuntu0.2 | rsync 3.4.1+ds1-7ubuntu0.2 | May 19, 2026 |
| rsync · amzn 2023 | 3.5.1-1.amzn2023.0.1 | ALAS2023-2026-3131 | Sep 28, 2026 |
| rsync · opensuse-leap 16.0 | 3.4.1-160000.6.1 | OPENSUSE-SU-2026:21650-1 | Aug 26, 2026 |
| rsync · sles 16.0 | 3.4.1-160000.6.1 | SUSE-SU-2026:23323-1 | Aug 26, 2026 |
| rsync-daemon · amzn 2023 | 3.5.1-1.amzn2023.0.1 | ALAS2023-2026-3131 | Sep 28, 2026 |
| rsync-debuginfo · amzn 2023 | 3.5.1-1.amzn2023.0.1 | ALAS2023-2026-3131 | Sep 28, 2026 |
| rsync-debugsource · amzn 2023 | 3.5.1-1.amzn2023.0.1 | ALAS2023-2026-3131 | Sep 28, 2026 |
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