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Fencer Vulns
high 7.5

CVE-2026-78667 json

Lack of limit on size of parsed Range headers in net/http

published 2026-10-08 31 d ago modified 2026-10-16 23 d ago also BIT-golang-2026-78667 , EUVD-2026-95424 , GO-2026-6609

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.

Patch / fix

  • bitnami golang 1.26.9, 1.27.2
  • go stdlib 1.26.9, 1.27.2
  • Go standard library net/http 1.26.9, 1.27.2
  • golang-1.26 Debian 14 1.26.9-1
  • golang-1.27 Debian 14 1.27.2-1

debian advisories DEBIAN-CVE-2026-78667

  • 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-2026-78667

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

  • 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
  • go1.26 SLES for SAP applications 16.0, SLES 16.0 1.26.9-160000.1.1
  • go1.27 SLES for SAP applications 16.0, SLES 16.0 1.27.2-160000.1.1
  • go1.26 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.26.9-150000.1.33.1
  • go1.27 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.27.2-150000.1.12.1

suse advisories SUSE-SU-2026:4867-1SUSE-SU-2026:4866-1SUSE-SU-2026:24239-1SUSE-SU-2026:24237-1SUSE-SU-2026:4629-1SUSE-SU-2026:4625-1

  • tempo-cli openSUSE Tumbleweed 3.1.1-1.1
  • go1.26 openSUSE Leap 16.0 1.26.9-160000.1.1
  • go1.27 openSUSE Leap 16.0 1.27.2-160000.1.1
  • rclone openSUSE Tumbleweed 1.75.2-1.1
  • go1.27 openSUSE Tumbleweed 1.27.2-1.1
  • go1.26 openSUSE Tumbleweed 1.26.9-1.1

opensuse advisories openSUSE-SU-2026:12351-1openSUSE-SU-2026:22095-1openSUSE-SU-2026:22093-1openSUSE-SU-2026:12112-1openSUSE-SU-2026:12101-1openSUSE-SU-2026:12093-1

  • 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
  • grafana AlmaLinux 9 10.2.6-23.el9_8.7
  • grafana-selinux AlmaLinux 9 10.2.6-23.el9_8.7
  • oci-seccomp-bpf-hook AlmaLinux 10 1.2.11-3.el10_2
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+4047+545787c4
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3845+87b84552

almalinux advisories ALSA-2026:95519ALSA-2026:93596ALSA-2026:93617ALSA-2026:89744ALSA-2026:89752ALSA-2026:89760

  • 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
  • podman Rocky Linux 9 6:5.8.2-8.el9_8
  • buildah Rocky Linux 9 2:1.43.4-2.el9_8
  • skopeo Rocky Linux 9 2:1.22.2-9.el9_8
  • oci-seccomp-bpf-hook Rocky Linux 10 1.2.11-3.el10_2
  • skopeo Rocky Linux 10 2:1.22.2-6.el10_2

rocky linux advisories RLSA-2026:95519RLSA-2026:93596RLSA-2026:93617RLSA-2026:90362RLSA-2026:90424RLSA-2026:90462

  • go Alpine 3.24 1.26.9-r0

alpine advisories ALPINE-CVE-2026-78667

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

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-2026-78667 updated cvss 7.5

net/http: golang: golang: Denial of Service via crafted HTTP Range headers

  • 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
  • Red Hat OpenShift Pipelines openshift-pipelines-client 1.15.3-11580.el8
    affected: workaround, no fix planned “Will not fix”
  • 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 openshift-golang-builder-container
    affected: workaround, no fix available
  • Red Hat Ceph Storage 7 thrift Red Hat Ceph Storage 8 thrift, thrift-qt, perl-thrift, thrift-glib, python3-thrift Red Hat Ceph Storage 9 thrift, libarrow, parquet-libs
    affected: workaround, no fix available “Fix deferred”
  • 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 Edge Manager 1 flightctl 1.3.1-1.el10 Red Hat Enterprise Linux 7 rhc, rhc-worker-script Red Hat Enterprise Linux 8 git-lfs, grafana-pcp, osbuild-composer, osbuild-composer-core, osbuild-composer-worker, git-lfs 3.7.1-5.el10_2.7, +3 more Red Hat Enterprise Linux 9 git-lfs, grafana-pcp, image-builder, gvisor-tap-vsock, osbuild-composer, oci-seccomp-bpf-hook, +11 more Red Hat Enterprise Linux 10 oci-delta 0.3.0-1.el10, git-lfs 3.7.1-5.el10_2.7, image-builder 52.1-2.el10_2, grafana-pcp 5.3.0-8.el10_2.1, yggdrasil 0.4.9.2-1.el10_2.3, gvisor-tap-vsock 0.8.7-1.el10, +2 more
    +9 more products
    Red Hat Enterprise Linux AI (RHEL AI) 3 golang 1.25.1-1.el9 Red Hat OpenShift AI (RHOAI) rhoai/odh-trainer-rhel9, rhoai/odh-core-bff-rhel9, rhoai/odh-eval-hub-rhel9, rhoai/odh-maas-api-rhel9, rhoai/odh-rhel9-operator, rhoai/odh-llm-d-async-rhel9, +68 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 on AWS rosa 1.2.64-b2f7c89.el8 Red Hat OpenShift Virtualization 4 openshift-golang-builder-container 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
  • Red Hat Ansible Automation Orchestrator 2026 ansible-automation-platform/automation-orchestrator-rhel9-operator Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9 Red Hat AWS Load Balancer Operator albo/aws-load-balancer-rhel8-operator Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/jetstack-cert-manager-rhel9 Red Hat Compliance Operator compliance/openshift-compliance-operator-bundle Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9-operator
    +11 more products
    Red Hat Cost Management Metrics Operator costmanagement/costmanagement-metrics-rhel9-operator Red Hat Cost Management On Premise costmanagement/costmanagement-ingress-rhel9 Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9 Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9 Red Hat Deployment Validation Operator dvo/deployment-validation-rhel8-operator Red Hat DPU kit for NVIDIA dpu-kit-for-nvidia/dpf-hcp-provisioner-rhel10-operator Red Hat External Secrets Operator for Red Hat OpenShift external-secrets-operator/external-secrets-rhel9 Red Hat Fence Agents Remediation Operator workload-availability/fence-agents-remediation-rhel8-operator Red Hat File Integrity Operator compliance/openshift-file-integrity-rhel8-operator Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9-operator Red Hat Helm CLI for Red Hat OpenShift helm-cli/helm-cli-rhel9
    under investigation

60 more under investigation, 34 more fixed, 29 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

0.66% chance of exploitation in the next 30 days, higher than 51% 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

Affected products

  • Go standard library net/http

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.