unbound: Unbound: Denial of Service via use-after-free in DoH stream cleanup

A use-after-free vulnerability in Unbound's DNS-over-HTTPS DoH stream cleanup code allows a remote attacker to cause a denial of service DoS. When DoH support is compiled, sending a specially crafted DoH connection under specific failure conditions—such as an RPZ drop query or heavy traffic—cause...

CVE-2026-82720

A use-after-free vulnerability in Unbound's DNS-over-HTTPS DoH stream cleanup code allows a remote attacker to cause a denial of service DoS. When DoH support is compiled, sending a specially crafted DoH connection under specific failure conditions—such as an RPZ drop query or heavy traffic—cause...

CVE-2026-82720 Use-after-free in DoH stream cleanup code path

NLnet Labs Unbound 1.12.0 up to and including 1.26.0 has a use-after-free vulnerability when compiled for DNS-over-HTTPs support with '--with-libnghttp2'. During failure code paths i.e., RPZ drop query, jostle due to heavy traffic, a dropped DoH stream brings down the whole DoH session and does n...