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CVE-2026-3591 is a stack use-after-return vulnerability in the BIND 9 named server when processing DNS queries signed with SIG(0). During asynchronous signature verification, code in the request-handling path passes a pointer to a stack-allocated source-address structure into later view-selection and ACL-evaluation logic. If the request-handling function returns before the asynchronous verification callback executes, the stored pointer refers to invalid stack memory. When the callback later performs ACL checks, it may dereference stale data and evaluate the client source address incorrectly. This can cause access-control decisions to be made against corrupted or unintended address data rather than the actual requester. Affected versions are BIND 9 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 9.18.x and 9.18.x-S1 are reported as not affected.
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13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stack use-after-return vulnerability in ISC BIND 9 SIG(0) handling code that may enable ACL bypass.
A stack use-after-return vulnerability in the BIND 9 named server's SIG(0) handling path that can cause incorrect ACL evaluation and potentially allow ACL/view bypass during asynchronous signature verification.
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.