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Fencer Vulns
medium 6.9

CVE-2026-116585 json

Go JOSE: Panic during CBC-HMAC processing

published 2026-10-26 13 d ago modified 2026-10-31 9 d ago also GHSA-4w3g-jfj2-cw2q , EUVD-2026-110465

cvss
6.9
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 18%
public exploits
0
none known

Summary

Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web Token (JWT) standards. Prior to 4.1.5, decrypting untrusted JWE ciphertext with A128CBC-HS256, A192CBC-HS384, or A256CBC-HS512 can pass an empty ciphertext buffer to CBC-HMAC unpadding. Insufficient validation allows the empty buffer to be indexed, causing a panic and denial of service. Applications that decrypt attacker-controlled ciphertext with one of these content-encryption algorithms are affected. This issue is fixed in version 4.1.5.

Patch / fix

  • go github.com/go-jose/go-jose/v4 4.1.5
  • google-cloud-sap-agent SLES for SAP applications 16.0, SLES 16.0 3.15-160000.5.1

suse advisories SUSE-SU-2026:24604-1

  • alloy openSUSE Tumbleweed 1.21.3-1.1
  • google-extension-manager openSUSE Tumbleweed 20261105.00-1.1
  • skopeo openSUSE Tumbleweed 1.24.0-2.1
  • syft openSUSE Tumbleweed 1.56.0-1.1
  • google-guest-agent openSUSE Tumbleweed 20261022.00-2.1
  • google-osconfig-agent openSUSE Tumbleweed 20261022.00-2.1
  • hugo openSUSE Tumbleweed 0.169.0-1.1
  • azure-storage-azcopy openSUSE Tumbleweed 10.34.1-2.1

opensuse advisories openSUSE-SU-2026:12446-1openSUSE-SU-2026:12456-1openSUSE-SU-2026:12478-1openSUSE-SU-2026:12479-1openSUSE-SU-2026:12386-1openSUSE-SU-2026:12387-1

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-2026-116585 updated cvss 7.5

github.com/go-jose/go-jose: go-jose: Denial of Service via empty ciphertext buffer during JWE decryption

  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/kube-rbac-proxy-mce-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9-operator
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/kube-rbac-proxy-rhel9 Red Hat OpenShift AI (RHOAI) rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-kserve-controller-rhel9, rhoai/odh-kserve-llmisvc-controller-rhel9, rhoai/odh-trustyai-service-operator-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-kube-rbac-proxy-rhel9, openshift4/ose-agent-installer-api-server-rhel8, openshift4/ose-agent-installer-api-server-rhel9, openshift4/ose-agent-installer-node-agent-rhel9, openshift4/ose-openshift-controller-manager-rhel8
    affected: workaround, no fix available
  • Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9, openshift-service-mesh/kiali-operator-bundle
    not affected: component not present
  • Red Hat OpenShift Container Platform 4 openshift4/ose-agent-installer-csr-approver-rhel8, openshift4/ose-agent-installer-csr-approver-rhel9, openshift4/ose-agent-installer-orchestrator-rhel8, openshift4/ose-agent-installer-orchestrator-rhel9
    not affected: vulnerable code not in execute path

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
9 d ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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/go-jose/go-jose/v4
<4.1.5
4.1.5
go github.com/go-jose/go-jose/v3
<=3.0.5
 no fix listed

Affected products

  • go-jose go-jose

Classification

Weakness
  • CWE-129 Improper Validation of Array Index

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.