CVE-2026-73507
Description
A flaw was found in Netty's XmlFrameDecoder component. An unauthenticated remote attacker could send specially crafted XML closing-tag sequences. This could cause the system to repeatedly rescan accumulated data, leading to high CPU utilization and a denial of service (DoS).
Statement
A flaw was found in Netty's XmlFrameDecoder component within the netty-codec-xml library. Red Hat products including JBoss EAP 7, Red Hat Fuse 7, Red Hat Single Sign-On 7, and Red Hat Integration Camel Spring Boot ship the netty-codec-xml library. However, these products do not utilize the XmlFrameDecoder class for XML processing. The vulnerable code path, which handles reassembly of fragmented XML messages across network frames, is not instantiated or exercised in Red Hat product deployments. This vulnerability only affects custom applications that explicitly use XmlFrameDecoder to parse untrusted XML input from network streams.
Mitigation
Red Hat products do not use the vulnerable XmlFrameDecoder component. No mitigation is required for standard product deployments. Custom applications built on Red Hat middleware that explicitly instantiate XmlFrameDecoder should avoid processing untrusted XML input or upgrade to netty-codec-xml 4.1.136.Final or later.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Amplification
An infinite loop will cause unexpected consumption of resources, such as CPU cycles or memory. The software's operation may slow down, or cause a long time to respond.
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