The newest point release in the OpenZFS 2.4 series lands as a stabilization update aimed squarely at the people running it on home servers and NAS boxes. OpenZFS 2.4.3, tagged on 2026-06-11 and signed by maintainer Tony Hutter, collects 64 commits since 2.4.2 and leans heavily into correctness. Among the fixes: a double free affecting blocks cloned after a dedup table prune, an off-by-one in the redacted-send handler that could drop the final block of a stream, and a zdb change that now detects block reference table and dedup table leaks during traversal. The dedup table pruning logic is part of the fast dedup feature that landed in recent OpenZFS releases, so anyone who has enabled it on a deduplicated pool is a direct beneficiary.
A second cluster of changes hardens how ZFS parses untrusted data. The release adds checks for un-terminated strings in packed nvlists, extra verification of size fields and strings, and validation of invalid characters in sharenfs properties. It also enforces an exact decompressed length for the lz4, gzip, and zstd compressors, closing the door on length mismatches during decompression. None of this touches the on-disk format, so pools stay compatible and the upgrade is a straightforward package bump rather than a feature migration.
Platform coverage gets a refresh. The supported Linux kernel range stays at 4.18 through 7.0, with additional compatibility fixes including a fs_parse correction for Linux 5.6, proper application of read-only and read-write mount options to the superblock, and several lock-inversion and lockdep annotations around resume and xattr paths. An aarch64 build failure was fixed by dropping an earlyclobber constraint, which matters for the growing number of ARM single-board computers and mini PCs pressed into service as low-power ZFS storage. On the BSD side, FreeBSD 13.5 was retired from testing after reaching end of life on 2026-04-30, while FreeBSD 15.0-RELEASE and 15.1-STABLE joined the matrix, alongside a new Ubuntu 26.04 builder and a Lustre 6.16 kernel compatibility fix.
For self-hosters running ZFS under TrueNAS, Proxmox, or a hand-rolled homelab NAS, 2.4.3 is the kind of release worth taking promptly: it is almost entirely fixes and hardening with no behavioral surprises. Source tarballs and the full changelog are available from the OpenZFS GitHub repository, with distribution packages following through the usual channels as maintainers rebuild against the new tag.
