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CVE-2019-9516 is an HTTP/2 resource-exhaustion vulnerability in affected HTTP/2 implementations, including implementations used by mod_http2, nghttp2, Jetty, Node.js, nginx, and Undertow. A malicious peer can send header fields with both an empty name and an empty value, including forms Huffman-encoded into one or more bytes. Vulnerable implementations allocate memory while processing these headers but retain the allocations until the HTTP/2 session terminates. Repetition within long-lived sessions causes unbounded memory retention.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Undertow HTTP/2 denial-of-service vulnerability caused by zero-length headers.
A Jetty HTTP/2 denial-of-service vulnerability triggered by zero-length headers.
An HTTP/2 denial-of-service flaw in Node.js triggered by zero-length headers.
An HTTP/2 denial-of-service vulnerability triggered through zero-length headers.
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.