CVE-2026-100302: Red Hat Denial of Service via unbounded multiRead response memory allocation
This Red Hat advisory covers CVE-2026-100302. Related products: Red Hat AMQ Broker 7, Red Hat Fuse 7, Red Hat Offline Knowledge Portal.
Key facts
- Vendor rating
- Medium, CVSS 6.5
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N· base score 7.1, scored by apacheAttack vector: network. Attack complexity: low. Attack requirements: none. Privileges required: low. User interaction: none. Confidentiality impact on the vulnerable system: none. Integrity impact on the vulnerable system: none. Availability impact on the vulnerable system: high. Confidentiality impact on subsequent systems: none. Integrity impact on subsequent systems: none. Availability impact on subsequent systems: none.- Weakness
- CWE-770 Allocation of resources without limits or throttling
- CISA SSVC
- Exploitation: none observed. Automatable: no. Technical impact: partial. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Related products & platforms
Description
Denial of Service via unbounded multiRead response memory allocation. Red Hat rates this moderate (CVSS 6.5).
Weakness: CWE-770.
Affected products named by the advisory: Red Hat AMQ Broker 7; Red Hat Fuse 7; Red Hat Offline Knowledge Portal; Red Hat OpenShift AI (RHOAI).
Text from the source record.
How to fix CVE-2026-100302
Vendor guidance
- Restrict network access to the Apache ZooKeeper client port (default TCP 2181) to trusted internal hosts and cluster members using firewall controls. 1. Restrict port access using `firewalld`: ``` firewall-cmd --permanent --zone=trusted --add-source=<TRUSTED_HOST_IP> firewall-cmd --permanent --remove-port=2181/tcp firewall-cmd --reload ``` 2. Caveats: Limiting access to ZooKeeper prevents unlisted hosts and applications from reaching the ensemble. Ensure all legitimate cluster nodes, dependent services, and monitoring probes are permitted before applying the firewall policy. Warning: Reloading the firewall configuration using `firewall-cmd --reload` applies modifications immediately and may drop or briefly disrupt active network connections. Verify all rules in advance.
CVE-2026-100302 in other vendors' advisories
- Apache: CVE-2026-100302, high severity, fixed in 3.9.7
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