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Fencer Vulns
high 7.5

CVE-2026-93748 json

http-cache-semantics through 4.2.0 Cross-User Cache Disclosure via max-stale

published 2026-09-18 51 d ago modified 2026-11-05 4 d ago also EUVD-2026-83253 , GHSA-ch52-4w7c-c8xp

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.

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-2026-93748 updated cvss 7.5

http-cache-semantics: http-cache-semantics: Information Disclosure via max-stale directive

  • Red Hat Exploit Intelligence exploit-intelligence/vulnerability-analysis-rhel9 Red Hat AMQ Broker 7 amq-broker-maven-repository.zip Red Hat build of Apache Camel - HawtIO 4 rhaf-hawtio-maven-repository.zip
    affected: workaround, no fix available
  • Red Hat Connectivity Link 1 rhcl-1/rhcl-console-plugin-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-gaudi-rhel9 Red Hat Fuse 7 http-cache-semantics Red Hat JBoss Enterprise Application Platform 7 jboss-eap-patch.zip, jboss-eap-maven-repository.zip, jboss-eap-full-maven-repository.zip, jboss-eap-runtime-maven-repository.zip, jboss-eap-incremental-maven-repository.zip
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 5 openshift5/ose-console-rhel9 Red Hat Openshift Data Foundation 4 odf4/ocs-client-console-rhel9, odf4/odf-multicluster-console-rhel9
    affected: workaround, no fix available
  • Red Hat Single Sign-On 7 rh-sso-server-dist.zip
    affected: workaround, no fix planned “Will not fix”
  • Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine/console-mce-rhel9 1792886718
    fixed: vendor fix RHSA-2026:92303
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/console-rhel9 1792883111
    fixed: vendor fix RHSA-2026:92307
  • Red Hat Developer Hub 1.10 rhdh/rhdh-hub-rhel9 1792593817
    fixed: vendor fix RHSA-2026:88198
  • Red Hat OpenShift AI 3.4 rhoai/odh-feature-server-rhel9 1791863220
    fixed: vendor fix RHSA-2026:84734
show 13 more
  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9
    not affected: vulnerable code cannot be controlled by adversary
  • Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Migration Toolkit for Applications 8 mta/mta-cli-rhel9, mta/mta-nodejs-external-provider-rhel9, mta/mta-generic-external-provider-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-ui-rhel8 Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine/hive-rhel9 1793055767, multicluster-engine/work-rhel9 1792867410, multicluster-engine/discovery-rhel9 1792864323, multicluster-engine/placement-rhel9 1792887454, multicluster-engine/must-gather-rhel9 1792838494, multicluster-engine/registration-rhel9 1792885410, +20 more
    not affected: vulnerable code not present
  • Red Hat 3scale API Management Platform 2 3scale-amp2/toolbox-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/thanos-rhel9 1792872550, rhacm2/acm-cli-rhel9 1792972427, rhacm2/prometheus-rhel9 1792853139, rhacm2/acm-grafana-rhel9 1792865487, rhacm2/acm-search-v2-rhel9 1792847370, rhacm2/node-exporter-rhel9 1792872412, +37 more Red Hat AMQ Broker 7 amq-broker-bin.zip
    not affected: vulnerable code not present
  • Red Hat build of Apache Camel for Spring Boot 4 rhaf-camel-maven-repository.zip, rhaf-camel-spring-boot-maven-repository.zip, rhaf-camel-for-springboot-maven-repository.zip
    not affected: component not present
  • Red Hat Build of Podman Desktop rh-podman-desktop
    not affected: vulnerable code not present
  • Red Hat Developer Hub 1 rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend, rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend
    not affected: vulnerable code not in execute path
  • Red Hat Developer Hub 1.10 rhdh/rhdh-rhel9-operator 1792594036, rhdh/rhdh-operator-bundle 1792597359, rhdh/rhdh-must-gather-rhel9 1792501528, rhdh/rhdh-rag-content-rhel9 1792500854
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 8 npm, dotnet, nodejs, grafana, dotnet9.0, dotnet-host, +32 more Red Hat Enterprise Linux 9 npm, nodejs, grafana, sgx-mpa, tdx-qgs, sgx-libs, +24 more Red Hat Enterprise Linux 10 grafana, nodejs22, nodejs24, nodejs26, dotnet9.0, linux-sgx, +1 more
    not affected: vulnerable code not in execute path
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/disk-image-cuda-rhel9
    not affected: vulnerable code not present
  • Red Hat Hardened Images dotnet9.0, dotnet10.0 10.0.112-1.hum1, dotnet8.0 8.0.130-0.1.hum1, grafana13.1 13.1.6-0.2.hum1, grafana13.2 13.2.1-0.5.hum1, grafana12.4 12.4.10-0.6.hum1
    not affected: component not present
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-mod-arch-automl-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, +6 more Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1791509689, rhoai/rhai-cli-rhel9 1791509689, rhoai/odh-automl-rhel9 1791535789, rhoai/odh-mlflow-rhel9 1791865967, rhoai/odh-autorag-rhel9 1791557539, rhoai/odh-trainer-rhel9 1791869783, +99 more Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-console-rhel9, openshift4/ose-agent-installer-ui-rhel9 Red Hat OpenShift Container Platform 5 openshift5/ose-agent-installer-ui-rhel9 Red Hat Openshift Data Foundation 4 odf4/mcg-core-rhel9, odf4/odf-console-rhel9 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9, devspaces/openvsx-rhel9, devspaces/dashboard-rhel9, devspaces/pluginregistry-rhel9
    +2 more products
    Red Hat Satellite 6 satellite/iop-remediations-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portal, ansible-automation-platform/bootc-automation-portal-rhel9
    not affected: vulnerable code 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
yes
Technical impact
partial
Assessed
25 d ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% 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:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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 products

  • kornelski http-cache-semantics

Classification

Weakness
  • CWE-524 Use of Cache Containing Sensitive Information

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.