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CVE-2026-82720 is a use-after-free vulnerability in NLnet Labs Unbound DNS-over-HTTPS stream-cleanup handling. It affects Unbound versions 1.12.0 through 1.26.0 when built with libnghttp2 support and configured to provide DNS-over-HTTPS. In failure paths, including RPZ-driven query drops and jostling under heavy traffic, dropping one DNS-over-HTTPS stream can tear down the shared HTTP/2 session without correctly accounting for other streams in that session. Subsequent cleanup-path access can reference freed memory. The affected reads are not attacker-controlled and ordinarily result in early returns.
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What an attacker gets, and what they’ve been doing with it.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A medium-severity, limited-impact denial-of-service vulnerability in Unbound installations built with libnghttp2 support and configured with an HTTPS port.
A use-after-free vulnerability in the DNS-over-HTTPS (DoH) stream-cleanup code path.
A use-after-free vulnerability in Unbound's DNS-over-HTTPS stream cleanup path.
A use-after-free vulnerability in Unbound's DNS-over-HTTPS stream-cleanup code path.
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.