Vulnerability DatabaseCVE-2026-56853
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CVE-2026-56853
Published:August 13, 2026
Updated:August 31, 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
https://github.com/golang/go.git (GITHUB):
Affected version(s) >=go1.26.0 <go1.26.6
Fix Suggestion:
Update to version go1.26.6
https://github.com/golang/go.git (GITHUB):
Affected version(s) >=go1 <go1.25.13
Fix Suggestion:
Update to version go1.25.13
Related Resources (4)
https://pkg.go.dev/vuln/GO-2026-6089
https://groups.google.com/g/golang-announce/c/94pEornpRlI
https://go.dev/issue/80205
https://go.dev/cl/795540
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
CWE-770
EPSS
Base Score:
0.57