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CVE-2026-33811 is a double-free vulnerability in Go's net package. An application that invokes LookupCNAME while using the cgo DNS resolver can mishandle an excessively long DNS CNAME response, causing C memory to be freed twice. The resulting memory-management error crashes the affected application.
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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.
62 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in Go's net package caused by a long CNAME response processed by LookupCNAME.
A denial-of-service vulnerability in Go's net package caused by a long CNAME response processed by LookupCNAME.
A denial-of-service vulnerability in Go's net package caused by a long CNAME response processed by LookupCNAME.
A denial-of-service vulnerability in Go's net package caused by a long CNAME response processed by LookupCNAME, affecting Red Hat Enterprise Linux CoreOS and OpenShift Container Platform packages covered by RHSA-2026:56852.
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.