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Fencer Vulns
high 8.7

CVE-2026-116591 json

compress zstd: Panic on two-block frames

published 2026-10-26 13 d ago modified 2026-11-05 3 d ago also GHSA-fpmh-frq8-7rj8 , GO-2026-6865 , EUVD-2026-110497

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

compress provides various compression algorithms. Prior to 1.20.2, the zstd DecodeAll and streaming decoder paths can panic when a crafted two-block frame reaches huff0.ReadTable with an FSE normalized count of 32768 that readNCount stores in int16 as -32768. The wrapped count allows buildDtable to retain stale fse.Scratch decode-table state from the prior block, and nextFast then derives an out-of-range state and indexes beyond the table instead of returning a decode error. Both blocks are required to preserve and then reuse the stale state, allowing untrusted zstd input to crash an application. This issue is fixed in version 1.20.2.

Patch / fix

  • go github.com/klauspost/compress/zstd 1.20.2
  • go github.com/klauspost/compress 1.20.2
  • golang-github-klauspost-compress Debian 14 1.20.3+ds1-1

debian advisories DEBIAN-CVE-2026-116591

  • syft openSUSE Tumbleweed 1.56.0-1.1
  • google-osconfig-agent openSUSE Tumbleweed 20261103.02-1.1
  • hauler openSUSE Leap 16.0 2.1.2-bp160.2.1
  • go-containerregistry openSUSE Leap 16.0 0.22.1-bp160.1.1
  • cadvisor openSUSE Leap 16.0 0.60.6-bp160.4.1
  • amazon-cloudwatch-agent openSUSE Tumbleweed 1.300073.2-3.1
  • aliyun-cli openSUSE Tumbleweed 3.5.2-2.1
  • cadvisor openSUSE Tumbleweed 0.60.6-5.1

opensuse advisories openSUSE-SU-2026:12479-1openSUSE-SU-2026:12430-1openSUSE-SU-2026:22228-1openSUSE-SU-2026:22227-1openSUSE-SU-2026:22218-1openSUSE-SU-2026:12340-1

  • docker Alpine 3.24 29.9.3-r0

alpine advisories ALPINE-CVE-2026-116591

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-2026-116591 updated cvss 7.5

github.com/klauspost/compress/zstd: klauspost/compress: Denial of Service via crafted zstd compressed input

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9, rhai/assisted-installer-agent-rhel9, rhai/assisted-installer-controller-rhel9, assisted/agent-preinstall-image-builder-rhel9 Red Hat AWS Load Balancer Operator albo/aws-load-balancer-controller-rhel8 Red Hat Builds for Red Hat OpenShift openshift-builds/openshift-builds-waiters-rhel9, openshift-builds/openshift-builds-webhook-rhel9, openshift-builds/openshift-builds-waiters-rhel10, openshift-builds/openshift-builds-webhook-rhel10, openshift-builds/openshift-builds-controller-rhel9, openshift-builds/openshift-builds-git-cloner-rhel9, +6 more Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/jetstack-cert-manager-rhel9, cert-manager/cert-manager-istio-csr-rhel9, cert-manager/jetstack-cert-manager-acmesolver-rhel9 Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-monitor-rhel9, openshift-sandboxed-containers/osc-rhel9-operator, openshift-sandboxed-containers/osc-podvm-payload-rhel9, openshift-sandboxed-containers/osc-cloud-api-adaptor-rhel9 Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9, cryostat/cryostat-grafana-dashboard-rhel9
    +6 more products
    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 File Integrity Operator compliance/openshift-file-integrity-rhel8-operator, compliance/openshift-file-integrity-operator-bundle Red Hat Helm CLI for Red Hat OpenShift helm-cli/helm-cli-rhel9 Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9
    affected: workaround, no fix available
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/eventrouter-rhel9, openshift-logging/logging-loki-rhel9, openshift-logging/lokistack-gateway-rhel9, openshift-logging/cluster-logging-rhel9-operator
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-controller-rhel8 Red Hat Multiarch Tuning Operator multiarch-tuning/multiarch-tuning-rhel9-operator, multiarch-tuning/multiarch-tuning-operator-bundle Red Hat Multicluster Engine for Kubernetes multicluster-engine/discovery-rhel9, multicluster-engine/assisted-installer-rhel8, multicluster-engine/assisted-installer-rhel9, multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/image-based-install-rhel9, +7 more Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-agent-rhel9, multicluster-globalhub/multicluster-globalhub-grafana-rhel9, multicluster-globalhub/multicluster-globalhub-manager-rhel9, multicluster-globalhub/multicluster-globalhub-rhel9-operator Red Hat Network Observability Operator network-observability/network-observability-ebpf-agent-rhel9, network-observability/network-observability-flowlogs-pipeline-rhel9 Red Hat OpenShift API for Data Protection oadp/oadp-velero-rhel9, oadp/oadp-rhel9-operator, oadp/oadp-non-admin-rhel9, oadp/oadp-mustgather-rhel9, oadp/oadp-cli-binaries-rhel9, oadp/oadp-velero-plugin-rhel9, +8 more
    +2 more products
    Red Hat OpenShift Developer Tools and Services helm Red Hat OpenShift Lightspeed openshift-lightspeed/otelcol-lightspeed-rhel9, openshift-lightspeed/lightspeed-rhel9-operator, openshift-lightspeed/openshift-mcp-server-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Pipelines openshift-pipelines-client, openshift-pipelines/pipelines-controller-rhel8, openshift-pipelines/pipelines-controller-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Serverless openshift-serverless-clients, openshift-serverless-1/kn-plugin-event-sender-rhel9, openshift-serverless-1/kn-plugin-func-func-util-rhel9 Red Hat OpenShift Source-to-Image (S2I) source-to-image/source-to-image-rhel8, source-to-image/source-to-image-rhel9 Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/thanos-rhel9, rhacm2/volsync-rhel9, rhacm2/prometheus-rhel9, rhacm2/acm-grafana-rhel9, rhacm2/node-exporter-rhel9, rhacm2/observatorium-rhel9, +23 more Red Hat Advanced Cluster Security 4 advanced-cluster-security/rhacs-main-rhel8, advanced-cluster-security/rhacs-roxctl-rhel8, advanced-cluster-security/rhacs-scanner-rhel8, advanced-cluster-security/rhacs-rhel8-operator, advanced-cluster-security/rhacs-scanner-v4-rhel8, advanced-cluster-security/rhacs-scanner-slim-rhel8 Red Hat Build of Podman Desktop rh-podman-desktop
    +12 more products
    Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 6 rhceph/rhceph-6-dashboard-rhel9 Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9, rhceph/rhceph-promtail-rhel9 Red Hat Ceph Storage 9 libarrow, parquet-libs, rhceph/alloy-rhel10, rhceph/grafana-rhel10 Red Hat Certification Program for Red Hat Enterprise Linux 9 redhat-certification-cnf, redhat-certification-preflight Red Hat Connectivity Link 1 rhcl-1/authorino-rhel9, rhcl-1/rhcl-rhel9-operator Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9 Red Hat Edge Manager 1 flightctl, rhem/flightctl-api-rhel9, rhem/flightctl-api-rhel10, rhem/flightctl-worker-rhel9, rhem/flightctl-worker-rhel10, rhem/flightctl-db-setup-rhel9, +21 more Red Hat Enterprise Linux 8 podman, skopeo, buildah, grafana, grafana-pcp, grafana-loki, +26 more Red Hat Enterprise Linux 9 podman, skopeo, buildah, grafana, oci-delta, grafana-pcp, +16 more Red Hat Enterprise Linux 10 podman, skopeo, buildah, grafana, oci-delta, grafana-pcp, +4 more
    affected: workaround, no fix available

17 more affected, 4 more fixed, 18 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
12 d ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
go github.com/klauspost/compress/zstd
<1.20.2
1.20.2
go github.com/klauspost/compress
<1.20.2
1.20.2

Affected products

  • klauspost compress

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.