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CVE-2016-6581 is a denial-of-service vulnerability in Python HPACK versions 1.0.0 through 2.2.0. An attacker can insert a header field sized to fill the HPACK dynamic header table, then submit a header block containing repeated references to that entry. Processing the references causes disproportionate expansion of the compressed input, producing compression amplification of approximately 4,096:1 or greater. HTTP/2 implementations built on the affected library, including affected Hyper HTTP/2 consumers, can therefore allocate excessive memory while decoding attacker-controlled header blocks.
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What an attacker gets, and what they’ve been doing with it.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity denial-of-service flaw in the Python HPACK library that permits amplification through oversized HTTP/2 HPACK header compression tables.
An HTTP/2 denial-of-service weakness involving HPACK header compression abuse, where small messages decompress into very large memory-consuming structures on the server.
A denial-of-service technique abusing HTTP/2 HPACK header compression to force excessive memory allocation and crash a server.
A previously disclosed HPACK-related denial-of-service issue referenced as an inspiration for HTTP/2 Bomb.
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.