Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN_UP macro. Reference: https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/
Upstream patches: https://github.com/NLnetLabs/unbound/commit/09707fc403a7e0d7f5ef0029c597c2645ba49dd5 https://github.com/NLnetLabs/unbound/commit/226298bbd36f1f0fd9608e98c2ae85988b7bbdb8
Statement: There is no available reproducer or proof of concept for this issue, nor it was ever proven the buffer overflow can happen in practice. Indeed this issue was initially considered just as "side-finding", according to the original report, and for this reason its Impact is Moderate.
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Extended Update Support Via RHSA-2024:0749 https://access.redhat.com/errata/RHSA-2024:0749