Infinite loop DoS in Go HTTP/2 transport SETTINGS_MAX_FRAME_SIZE handling
CVE-2026-33814 is a denial-of-service vulnerability in Go's HTTP/2 transport, referenced in net/http/internal/http2 in golang.org/x/net. When the client processes an HTTP/2 SETTINGS frame from a peer and receives SETTINGS_MAX_FRAME_SIZE with the invalid value 0, the transport can enter an infinite loop while writing CONTINUATION frames. The flaw is caused by improper validation of the received SETTINGS_MAX_FRAME_SIZE value before it is used by the HTTP/2 transport logic. A malicious HTTP/2 server can trigger this condition by sending the malformed SETTINGS parameter to a connecting client.
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Recent activity
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A denial-of-service vulnerability in Go's HTTP/2 transport handling where a malformed SETTINGS_MAX_FRAME_SIZE can trigger an infinite loop, causing loss of availability.
A denial-of-service vulnerability in Go's HTTP/2 transport where a malicious server can trigger an infinite loop of CONTINUATION frame writes by sending an invalid SETTINGS_MAX_FRAME_SIZE value of 0.
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