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CVE-2026-78227 is a use-after-free in NLnet Labs Unbound DNS-over-QUIC handling in versions 1.22.0 through 1.26.0. In builds compiled with libngtcp2 support, a DoQ stream's response output buffer can be freed after receipt of a QUIC RESET_STREAM while ngtcp2 retransmission state retains a shallow reference to that buffer. A subsequent probe-timeout retransmission re-encodes the STREAM frame and reads from the freed buffer.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A medium-severity denial-of-service vulnerability in Unbound installations built with libngtcp2 support and configured with a QUIC port.
A use-after-free vulnerability in a DNS-over-QUIC (DoQ) stream output buffer during reset retransmission.
A use-after-free flaw in Unbound's DNS-over-QUIC stream output-buffer handling during reset retransmission.
A use-after-free vulnerability in Unbound's DNS-over-QUIC stream output buffer during reset retransmission.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.