CVE-2026-111115: Red Hat Denial of Service via uncontrolled memory allocation in flexible request headers
This Red Hat advisory covers CVE-2026-111115. Related products: OpenShift Serverless, Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apache Camel for Spring Boot 4.
Key facts
- Vendor rating
- High, CVSS 7.5
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H· base score 9.1, scored by CISA-ADPAttack vector: network. Attack complexity: low. Privileges required: none. User interaction: none. Scope: unchanged. Confidentiality impact: high. Integrity impact: none. Availability impact: high.- CISA SSVC
- Exploitation: none observed. Automatable: yes. Technical impact: partial. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Versions named
- < 4.2.2; < 4.3.2; < 4.4.0
- Fixed in
- 4.2.2, 4.3.2, 4.4.0
- 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 uncontrolled memory allocation in flexible request headers. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-770.
Affected products named by the advisory: OpenShift Serverless; Red Hat build of Apache Camel 4 for Quarkus 3; Red Hat build of Apache Camel for Spring Boot 4; Red Hat build of Apicurio Registry 3; and 4 more.
Affected products named by the advisory: Red Hat build of Debezium 3; Red Hat build of Quarkus; Red Hat Fuse 7; streams for Apache Kafka 3.
Text from the source record.
- < 4.2.2
- < 4.3.2
- < 4.4.0
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-111115
Upgrade to a fixed release named by Red Hat:
- 4.2.2
- 4.3.2
- 4.4.0
Vendor guidance
- Restrict network exposure of Kafka broker listener ports and reduce the maximum permitted request frame size: 1. Restrict broker network access: Limit connectivity to broker listeners (default port 9092/tcp) to trusted clients and internal subnets using firewall rules: ``` firewall-cmd --permanent --zone=trusted --add-source=192.168.1.0/24 firewall-cmd --reload ``` 2. Reduce request size limits: In the Kafka broker configuration file (such as `server.properties`), reduce the outer request frame limit by lowering `socket.request.max.bytes` to a smaller value appropriate for your workload: ``` socket.request.max.bytes=10485760 ``` Caveats: Modifying `socket.request.max.bytes` requires restarting the Kafka broker service (`systemctl restart ...`), which causes a temporary interruption of service. Lowering this value will cause requests exceeding the threshold to be dropped, potentially affecting legitimate producers or consumers if set below maximum valid message sizes. Restricting network access and lowering the threshold reduces the amplification risk but does not entirely eliminate exposure for connections originating from permitted networks.
CVE-2026-111115 in other vendors' advisories
- Apache: CVE-2026-111115, fixed in 4.2.2, 4.3.2, 4.4.0
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