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Fencer Vulns
medium 6.1

CVE-2026-33812 json

Excessive memory allocation when decoding malicious SFNT in golang.org/x/image

published 2026-04-21 6 mo ago modified 2026-10-26 13 d ago also GO-2026-4962 , EUVD-2026-24245

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

Parsing a malicious font file can cause excessive memory allocation.

Patch / fix

  • go golang.org/x/image 0.39.0
  • golang.org/x/image golang.org/x/image/font/sfnt 0.39.0
  • golang-golang-x-image Debian 14 0.39.0-1

debian advisories DEBIAN-CVE-2026-33812

  • hugo hummingbird 1 0.166.0-0.1.hum1

red hat advisories RHSA-2026:66266

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

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-2026-33812 updated cvss 6.1

golang.org/x/image: golang.org/x/image: Denial of Service due to excessive memory allocation when parsing malicious font files

  • Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-event-sender-rhel9 Red Hat OpenShift Service Mesh 2 ossm-2/openshift-golang-builder-container, openshift-service-mesh/istio-rhel8-operator Red Hat OpenShift Service Mesh 3 ossm-2/openshift-golang-builder-container
    +11 more products
    Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/volsync-rhel9, rhacm2/acm-grafana-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform/platform-operator-bundle Red Hat Enterprise Linux 8 golang, go-toolset, golang-bin, golang-src, golang-misc, golang-race, +1 more Red Hat Enterprise Linux 9 golang, go-toolset, golang-bin, golang-src, golang-misc, golang-race, +1 more Red Hat Enterprise Linux 10 golang Red Hat Enterprise Linux AI (RHEL AI) 3 golang Red Hat OpenShift AI (RHOAI) rhoai/odh-model-registry-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-tests-rhel9, ossm-2/openshift-golang-builder-container Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9 Red Hat OpenShift Virtualization 4 ossm-2/openshift-golang-builder-container Red Hat OpenStack Platform 18.0 rhoso-operators/openstack-operator-bundle
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images hugo 0.166.0-0.1.hum1
    fixed: vendor fix RHSA-2026:66266
  • Red Hat Hardened Images etcd 3.7.1-0.1.hum1
    not affected: component not present

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
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Affected packages

ecosystem package affected fixed in
go golang.org/x/image
<0.39.0
0.39.0

Affected products

  • golang.org/x/image golang.org/x/image/font/sfnt

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.