CVE-2026-78667: CWE-770: Allocation of Resources Without Limits or Throttling in Go standard library net/http
Description
CVE-2026-78667 is a vulnerability in the Go standard library net/http package where parsing a Range header with many small ranges can cause excessive CPU consumption in FileServer(FS), ServeContent, and ServeFile(FS). This is due to allocation of resources without limits or throttling.
Affected software
Go standard library
net/http
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-78667 in the Go standard library net/http package involves improper handling of Range headers containing a large number of small ranges. When such headers are parsed by FileServer(FS), ServeContent, or ServeFile(FS), the system can consume an excessive amount of CPU resources due to allocation of resources without limits or throttling, classified under CWE-770.
Potential Impact
Excessive CPU consumption can degrade the performance of applications using the affected Go net/http functions, potentially leading to denial of service conditions under heavy or crafted Range header requests. There is no indication of remote code execution or data leakage from the provided data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting or filtering Range headers at the application or network level to prevent abuse.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Go
- Date Reserved
- 2026-08-24T23:36:15.738Z
- State
- PUBLISHED
Threat ID: 6ac821642cdf04f6564170dc
Added to database: 10/08/2026, 23:04:04 UTC
Last enriched: 10/08/2026, 23:19:23 UTC
Last updated: 10/08/2026, 23:19:23 UTC
Views: 5
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