Concurrency Issue in HTTP/2 Servers Affects Go Programming Language
CVE-2026-97032

Currently unrated

Key Information:

Vendor: Go Standard Library
Status: Net/http; Net/http/internal/http2; Golang.org/x/net/http2
Vendor: CVE Published:; 8 October 2026

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What is CVE-2026-97032?

An identified issue in HTTP/2 servers within the Go programming language involves a concurrency flaw in the HPACK encoder. This vulnerability arises when the server processes encoding for a HEADERS frame simultaneously with modifications to the header table size. A malicious client can exploit this by sending requests that alter the SETTINGS_HEADER_TABLE_SIZE, leading to server crashes. Proper synchronization mechanisms in the encoder are crucial to mitigate this vulnerability and ensure robust server performance.

Affected Version(s)

golang.org/x/net/http2 0 < 0.60.0

net/http 0 < 1.26.9

net/http/internal/http2 1.27.0-0 < 1.27.2

References

https://go.dev/cl/847188

https://go.dev/cl/847313

https://go.dev/issue/81867

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Timeline

Vulnerability published
Oct 8, 2026
Vulnerability Reserved
Sep 23, 2026

Credit

RyotaK (https://ryotak.net) of GMO Flatt Security Inc.

CVE-2026-97032 Data

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