Vulnerability Report: GO-2026-6089
- CVE-2026-56853
- Affects: net/http
- Published: Aug 13, 2026
When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.
Affected Packages
-
PathVersionsSymbols
-
before go1.25.13, from go1.26.0-0 before go1.26.6, from go1.27.0-0 before go1.27.0-rc.3
Aliases
References
- https://go.dev/issue/80205
- https://go.dev/cl/795540
- https://groups.google.com/g/golang-announce/c/94pEornpRlI
- https://vuln.go.dev/ID/GO-2026-6089.json
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