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CVE-2026-56853 is a denial-of-service vulnerability in Go's net/http server handling of unencrypted HTTP/2 (h2c) connections. When a server is configured to support unencrypted HTTP/2, net/http reads initial bytes of every new connection to detect the HTTP/2 client preface. This preface-detection read was performed without applying the server's configured ReadHeaderTimeout. Consequently, connections that stall during this initial check can remain open beyond the intended header-read deadline.
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No public exploit code observed for this vulnerability.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the Miracle Linux AXSA-2026-1689 update for Go-related packages on Miracle Linux 9.
A vulnerability addressed by the AlmaLinux ALSA-2026:60306 update for Go/Golang packages; no technical flaw details are provided.
A vulnerability addressed by the AlmaLinux ALSA-2026-60305 security update; no technical flaw description is provided in the content.
A vulnerability referenced by the Alma Linux ALSA-2026:60304 security advisory; no technical flaw description is provided in the content.
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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.