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Fencer Vulns
high 7.5

CVE-2026-78669 json

Excessive CPU consumption from repeated initial window changes in net/http

published 2026-10-08 31 d ago modified 2026-10-16 23 d ago also BIT-golang-2026-78669 , EUVD-2026-95426 , GO-2026-6611

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami golang 1.26.9, 1.27.2
  • go stdlib 1.26.9, 1.27.2
  • go golang.org/x/net 0.60.0
  • Go standard library net/http 1.26.9
  • Go standard library net/http/internal/http2 1.27.2
  • golang.org/x/net golang.org/x/net/http2 0.60.0
  • golang-1.26 Debian 14 1.26.9-1
  • golang-1.27 Debian 14 1.27.2-1
  • golang-golang-x-net Debian 14 1:0.60.0-1

debian advisories DEBIAN-CVE-2026-78669

  • golang-1.22 Ubuntu 22.04 LTS 1.22.2-2~22.04.4
  • golang-1.22 Ubuntu 24.04 LTS 1.22.2-2ubuntu0.5

ubuntu advisories UBUNTU-CVE-2026-78669

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • helm SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +10 more 3.22.1-150000.1.104.1
  • google-cloud-sap-agent SLES for SAP applications 16.0, SLES 16.0 3.15-160000.5.1
  • google-guest-agent Linux Micro 6.0 20261022.00-159998.1.1
  • google-guest-agent Linux Micro 6.1 20261022.00-slfo.1.1_1.1
  • google-osconfig-agent Linux Micro 6.0 20261015.00-159998.1.1
  • aws-iam-authenticator SLE Module for Public Cloud 15 SP7, SLE Module for Public Cloud 15 SP6, SLE Module for Public Cloud 15 SP5 +1 more 0.7.22-150000.1.23.1
  • go1.26-openssl SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.26.10-150000.1.21.2
  • go1.26-openssl SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 1.26.10-150600.13.18.1

suse advisories SUSE-SU-2026:5119-1SUSE-SU-2026:24604-1SUSE-SU-2026:24475-1SUSE-SU-2026:24555-1SUSE-SU-2026:24374-1SUSE-SU-2026:4891-1

  • alloy openSUSE Tumbleweed 1.21.3-1.1
  • gh openSUSE Leap 16.0 2.103.3-bp160.1.1
  • kubevirt1.9 openSUSE Leap 16.0 1.9.1-160000.1.1
  • cadvisor openSUSE Leap 16.0 0.60.6-bp160.3.1
  • hauler openSUSE Leap 16.0 2.1.2-bp160.1.1
  • trivy openSUSE Leap 16.0 0.76.1-160000.1.1
  • coredns openSUSE Leap 16.0 1.15.0-bp160.1.1
  • cadvisor openSUSE Tumbleweed 0.60.6-3.1

opensuse advisories openSUSE-SU-2026:12446-1openSUSE-SU-2026:22222-1openSUSE-SU-2026:22180-1openSUSE-SU-2026:22200-1openSUSE-SU-2026:22201-1openSUSE-SU-2026:22178-1

  • delve AlmaLinux 10 1.26.1-3.el10_2
  • opentelemetry-collector AlmaLinux 10 0.158.0-2.el10_2
  • opentelemetry-collector AlmaLinux 9 0.158.0-2.el9_8
  • yggdrasil AlmaLinux 10 0.4.9.2-1.el10_2.4
  • grafana AlmaLinux 9 10.2.6-23.el9_8.7
  • grafana-selinux AlmaLinux 9 10.2.6-23.el9_8.7
  • grafana AlmaLinux 8 9.2.10-36.el8_10
  • grafana-selinux AlmaLinux 8 9.2.10-36.el8_10

almalinux advisories ALSA-2026:95519ALSA-2026:93596ALSA-2026:93617ALSA-2026:91138ALSA-2026:89744ALSA-2026:88188

  • delve Rocky Linux 10 1.26.1-3.el10_2
  • opentelemetry-collector Rocky Linux 10 0.158.0-2.el10_2
  • opentelemetry-collector Rocky Linux 9 0.158.0-2.el9_8
  • yggdrasil Rocky Linux 10 0.4.9.2-1.el10_2.4
  • grafana Rocky Linux 9 10.2.6-23.el9_8.7
  • buildah Rocky Linux 10 2:1.43.1-7.el10_2
  • golang-github-openprinting-ipp-usb Rocky Linux 10 0.9.27-7.el10_2.4
  • grafana-pcp Rocky Linux 10 5.3.0-8.el10_2.2

rocky linux advisories RLSA-2026:95519RLSA-2026:93596RLSA-2026:93617RLSA-2026:91138RLSA-2026:89744RLSA-2026:88262

  • go Alpine 3.24 1.26.9-r0
  • docker Alpine 3.24 29.9.0-r0

alpine advisories ALPINE-CVE-2026-78669

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • application-gateway-kubernetes-ingress Azure Linux 3.0 1.7.7-7
  • azcopy Azure Linux 3.0 10.25.1-10
  • azurelinux-image-tools Azure Linux 3.0 1.7.0-2
  • cert-manager Azure Linux 3.0 1.12.15-15
  • cf-cli Azure Linux 3.0 8.7.11-10
  • cloud-provider-kubevirt Azure Linux 3.0 0.5.1-10
  • containerd2 Azure Linux 3.0 2.3.7-1
  • containerized-data-importer Azure Linux 3.0 1.62.0-9

azure linux advisories AZL-107138AZL-107150AZL-107174AZL-107189AZL-107201AZL-107213

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-78669 updated cvss 7.5

net/http: net/http/internal/http2: golang.org/x/net/http2: net/http: Denial of Service via excessive HTTP/2 SETTINGS frames

  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9, exploit-intelligence/vulnerability-analysis-rhel9, exploit-intelligence/exploit-intelligence-operator-controller-rhel9 Red Hat OpenShift Developer Tools and Services helm 3.22.0-90.el9
    affected: workaround, no fix available “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```”
  • Red Hat OpenShift Pipelines openshift-pipelines-client 1.15.3-11580.el8, openshift-pipelines/pipelines-scheduler-rhel9
    affected: workaround, no fix available, no fix planned “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```”
  • Red Hat OpenShift Serverless kn-workflow-plugin 1.38.1-1.el9, openshift-serverless-clients 1.17.0-4.el9 Red Hat OpenShift Service Mesh 3 istio-proxy-selinux, istio-proxy 1.30.5-1.el9, openshift-golang-builder-container
    affected: workaround, no fix available “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```”
  • Red Hat 3scale API Management Platform 2 3scale-amp2/3scale-operator-bundle
    affected: workaround, no fix planned “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```”
  • Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 6 rhceph/rhceph-6-dashboard-rhel9 Red Hat Certification Program for Red Hat Enterprise Linux 9 redhat-certification-cnf 9.0-20240522.1.el9, redhat-certification-preflight 9.42-20261005.el10 Red Hat Connectivity Link 1 rhcl-1/authorino-rhel9, rhcl-1/rhcl-operator-bundle Red Hat Developer Hub 1 rhdh/rhdh-rhel9-operator Red Hat Edge Manager 1 flightctl 1.2.1-1.el9
    +2 more products
    Red Hat Enterprise Linux 7 rhc, host-metering, rhc-worker-script, host-metering-selinux Red Hat Enterprise Linux 8 podman, skopeo, buildah, git-lfs, podman-tests, skopeo-tests, +14 more
    affected: workaround, no fix available “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```”
  • Red Hat Enterprise Linux 9 delve, podman, skopeo, buildah, git-lfs, ignition, +25 more Red Hat Enterprise Linux 10 oci-delta 0.3.0-1.el10, skopeo 1.22.2-5.el10_2, git-lfs 3.7.1-5.el10_2.7, ignition 2.21.0-3.el10_0.4, image-builder 52.1-2.el10_2, go-fdo-client 1.0.0-4.el10_2.7, +4 more
    affected: workaround, no fix available, no fix planned “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 golang 1.25.1-1.el9, rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9, +1 more Red Hat OpenShift AI (RHOAI) rhoai/rhai-cli-rhel9, rhoai/odh-trainer-rhel9, rhoai/odh-core-bff-rhel9, rhoai/odh-eval-hub-rhel9, rhoai/odh-maas-api-rhel9, rhoai/odh-rhel9-operator, +70 more Red Hat OpenShift Container Platform 4 cri-o, butane, podman, skopeo, ignition, cri-tools, +52 more Red Hat OpenShift Container Platform 5 cri-o, cri-tools, openshift, microshift, openshift-clients, ose-crio-credential-provider, +3 more Red Hat Openshift Data Foundation 4 odf4/ocs-metrics-exporter-rhel9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9
    +7 more products
    Red Hat OpenShift Dev Workspaces Operator devworkspace/devworkspace-project-clone-rhel9 Red Hat OpenShift on AWS rosa 1.2.64-b2f7c89.el8 Red Hat OpenShift Virtualization 4 openshift-golang-builder-container Red Hat OpenStack Platform 18.0 etcd 3.4.26-4.el9ost Red Hat Service Interconnect 1 skupper-cli 1.8.8-1.el9 Red Hat Service Interconnect 2 skupper-cli 1.8.8-1.el9 Red Hat streams for Apache Kafka 3 golang-github-danielqsj-kafka_exporter 1.9.0-12.el9
    affected: workaround, no fix available “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```”
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-grafana-dashboard-rhel9 4.2.0-19
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:95360
show 8 more
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 receptor 1.6.9-3.el9ap Red Hat Ansible Automation Platform 2.6 for RHEL 10 receptor 1.6.9-3.el10ap
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:92621
  • Red Hat Ansible Automation Platform 2.7 for RHEL 9 receptor 1.6.9-3.el9ap Red Hat Ansible Automation Platform 2.7 for RHEL 10 receptor 1.6.9-3.el10ap
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:92622
  • Red Hat CodeReady Linux Builder EUS (v.9.6) rhc-devel 0.2.7-1.el9_6.8, rhc-debuginfo 0.2.7-1.el9_6.8, rhc-debugsource 0.2.7-1.el9_6.8
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:89914
  • Red Hat Enterprise Linux AppStream (v. 8) rhc 0.2.5-13.el8_10, grafana 9.2.10-36.el8_10, grafana-pcp 5.1.1-19.el8_10, grafana-selinux 9.2.10-36.el8_10, delve 1.26.1-1.module+el8.10.0+24516+40554724, golang 1.26.10-1.module+el8.10.0+25107+6b50279c, +6 more
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:86203
  • Red Hat Enterprise Linux AppStream (v. 9) rhc 0.2.7-16.el9_8, golang 1.26.10-1.el9_8, grafana 10.2.6-23.el9_8.7, go-toolset 1.26.10-1.el9_8, golang-bin 1.26.10-1.el9_8, golang-src 1.26.10-1.el9_8, +6 more
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:86196
  • Red Hat Enterprise Linux AppStream (v. 10) rhc 0.3.8-8.el10_2, delve 1.26.1-3.el10_2, podman 5.8.2-11.el10_2, buildah 1.43.1-7.el10_2, golang 1.26.10-1.el10_2, ipp-usb 0.9.27-7.el10_2.4, +14 more
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:88262
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) rhc 0.2.0-6.el8_4.2, git-lfs 2.13.3-3.el8_4.6, osbuild-composer 28.7-7.el8_4, osbuild-composer-core 28.7-7.el8_4, osbuild-composer-worker 28.7-7.el8_4, delve 1.26.1-1.module+el8.4.0+25181+7ce5b91c, +7 more
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:90994
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) rhc 0.2.1-14.el8_6.1, grafana 7.5.11-12.el8_6, grafana-pcp 3.2.0-4.el8_6.2, delve 1.26.1-1.module+el8.6.0+24782+a062e766, golang 1.26.10-4.module+el8.6.0+25114+90ecdb41, go-toolset 1.26.10-4.module+el8.6.0+25114+90ecdb41, +5 more
    fixed: vendor fix “In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ```” RHSA-2026:87246

28 more fixed, 33 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
30 d ago

Exploit prediction

0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami golang
<1.26.9
>=1.27.0-0, <1.27.2
1.26.9
1.27.2
go stdlib
<1.26.9
>=1.27.0-0, <1.27.2
1.26.9
1.27.2
go golang.org/x/net
<0.60.0
0.60.0

Affected products

  • Go standard library net/http
  • Go standard library net/http/internal/http2
  • golang.org/x/net golang.org/x/net/http2

Classification

Weakness
  • CWE-405 Asymmetric Resource Consumption (Amplification)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.