CVE-2026-786697.5HighCWE-405

CVE-2026-78669: Excessive CPU consumption from repeated initial window changes in net/http

Go standard library · net/http

Vendor fix available · Affected: Go standard library net/http · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.8%probability of exploitation in the next 30 days

58th percentile

050100

Higher than 58% of scored CVEs

7.5HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.

Affected products3

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Go standard library · net/httpbefore 1.26.9
Go standard library · net/http/internal/http2from 1.27.0-0 before 1.27.2
golang.org/x/net · golang.org/x/net/http2before 0.60.0

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Asymmetric Resource Consumption (Amplification) · Denial of Service
Vendor: Go standard library
Published: October 2026
Band: Unlikely (under 1%), October 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-78669 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.