CVE-2026-56853: CWE-770: Allocation of Resources Without Limits or Throttling in Go standard library net/http
CVE-2026-56853 is a vulnerability in the Go standard library's net/http package related to HTTP/2 support. When a server supports unencrypted HTTP/2, it reads initial bytes from new connections to detect the HTTP/2 client preface. However, the ReadHeaderTimeout setting is not applied during this initial read, potentially allowing resource allocation without limits or throttling.
AI Analysis
Technical Summary
This vulnerability (CWE-770) occurs because the net/http package in Go does not enforce the ReadHeaderTimeout when reading the HTTP/2 client preface on unencrypted HTTP/2 connections. This can lead to allocation of resources without proper limits or throttling, potentially allowing an attacker to exhaust server resources by opening many connections that are not properly timed out during this initial read phase.
Potential Impact
The impact is that a server using the affected versions of Go's net/http package may be vulnerable to resource exhaustion attacks due to lack of timeout enforcement when reading the HTTP/2 client preface. This could degrade service availability or cause denial of service under certain conditions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been published at this time. Users should monitor Go project advisories for updates and consider limiting exposure of unencrypted HTTP/2 services until a fix is available.
CVE-2026-56853: CWE-770: Allocation of Resources Without Limits or Throttling in Go standard library net/http
Description
CVE-2026-56853 is a vulnerability in the Go standard library's net/http package related to HTTP/2 support. When a server supports unencrypted HTTP/2, it reads initial bytes from new connections to detect the HTTP/2 client preface. However, the ReadHeaderTimeout setting is not applied during this initial read, potentially allowing resource allocation without limits or throttling.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-770) occurs because the net/http package in Go does not enforce the ReadHeaderTimeout when reading the HTTP/2 client preface on unencrypted HTTP/2 connections. This can lead to allocation of resources without proper limits or throttling, potentially allowing an attacker to exhaust server resources by opening many connections that are not properly timed out during this initial read phase.
Potential Impact
The impact is that a server using the affected versions of Go's net/http package may be vulnerable to resource exhaustion attacks due to lack of timeout enforcement when reading the HTTP/2 client preface. This could degrade service availability or cause denial of service under certain conditions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been published at this time. Users should monitor Go project advisories for updates and consider limiting exposure of unencrypted HTTP/2 services until a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Go
- Date Reserved
- 2026-06-23T15:10:49.352Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7e412ebf8831d539e05119
Added to database: 08/13/2026, 22:11:58 UTC
Last enriched: 08/13/2026, 22:28:00 UTC
Last updated: 08/13/2026, 23:23:35 UTC
Views: 3
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