CVE-2026-56853
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go standard library | net/http | 0 < 1.25.13 | affected |
| Go standard library | net/http | 1.26.0-0 < 1.26.6 | affected |
| Go standard library | net/http | 1.27.0-0 < 1.27.0-rc.3 | affected |
Weaknesses
- CWE-770: Allocation of Resources Without Limits or Throttling
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
- https://go.dev/issue/80205
- https://go.dev/cl/795540
- https://groups.google.com/g/golang-announce/c/94pEornpRlI
- https://pkg.go.dev/vuln/GO-2026-6089
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