Medium [CVE-2026-84933] Cross-user cookie disclosure via Set-Cookie caching
This medium-severity Red Hat Linux advisory covers CVE-2026-84933 affecting Exploit Intelligence, OpenShift Pipelines, Red Hat AMQ Broker 7.
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Summary
A flaw was found in undici. The software's caching mechanism, when operating in shared cache mode, improperly stores responses that include 'Set-Cookie' headers.
This oversight allows an untrusted server to inject cookies into cached responses. Consequently, sensitive cookie information from one user can be inadvertently disclosed to another user accessing the same cached content.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N). Weakness: CWE-524.
Affected Red Hat products: Exploit Intelligence; OpenShift Pipelines; Red Hat AMQ Broker 7; Red Hat Ansible Automation Platform 2; Red Hat Build of Podman Desktop; Red Hat Developer Hub; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Container Platform 4; Red Hat Openshift Data Foundation 4; Red Hat OpenShift Dev Spaces; Red Hat Trusted Artifact Signer; Secrets Management Console for Red Hat OpenShift; Self-service automation portal 2.
Red Hat lists Red Hat Hardened Images as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: grafana; Red Hat package: nodejs22; Red Hat package: nodejs24; Red Hat package: nodejs26.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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