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CVE-2026-40701 is a heap-use-after-free vulnerability in the ngx_http_ssl_module component of NGINX Plus and NGINX Open Source. It affects configurations with ssl_verify_client set to "on" or "optional" and ssl_ocsp set to "on" or "leaf", with a resolver configured. If a TLS connection closes before asynchronous OCSP DNS resolution completes, the connection context pool is destroyed without cancelling the resolver request. A subsequent DNS timer dereferences the freed pointer. Unauthenticated requests, together with conditions outside the attacker's control, may trigger limited data modification or an NGINX worker process restart. Software versions that have reached End of Technical Support were not evaluated.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability whose supplied CVSS vectors indicate no required privileges or user interaction, low confidentiality and availability impact, and no integrity impact. The content does not identify the affected product or technical cause. It lists a patch publication date of May 14, 2026.
A vulnerability referenced by the TuxCare Rocky Linux 9.6 local security-check advisory; no technical flaw details are provided.
A vulnerability referenced by an AlmaLinux 9.6 local security-check plugin and associated security advisory.
Another memory corruption vulnerability identified during the same NGINX research process, but not the primary focus of the reference.
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.