Upstream information
Description
HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having important severity.
| CVSS detail | CNA (MITRE) |
|---|---|
| Base Score | 7.5 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | High |
| CVSSv3 Version | 3.1 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise High Availability Extension 15 SP7 | haproxy | Affected |
| SUSE Linux Enterprise High Availability Extension 16.0 | haproxy | Affected |
| SUSE Linux Enterprise Micro 5.3 | haproxy | Affected |
| SUSE Linux Enterprise Micro 5.4 | haproxy | Affected |
| SUSE Linux Enterprise Micro 5.5 | haproxy | Affected |
| SUSE Linux Enterprise Server 16.1 | haproxy | Affected |
| SUSE Linux Enterprise Server 16.2 | haproxy | Affected |
| SUSE Linux Enterprise Server for NVIDIA 16.1 | haproxy | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | haproxy | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | haproxy | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.2 | haproxy | Affected |
| SUSE Linux Micro 6.0 | haproxy | Affected |
| SUSE Linux Micro 6.1 | haproxy | Affected |
| SUSE Linux Micro 6.2 | haproxy | Affected |
| openSUSE Leap 16.0 | haproxy | Affected |
| openSUSE Leap 16.1 | haproxy | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Availability Extension 12 SP5 | haproxy | Affected |
| SUSE Linux Enterprise High Availability Extension 15 SP4 | haproxy | Affected |
| SUSE Linux Enterprise High Availability Extension 15 SP5 | haproxy | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | haproxy | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise High Availability Extension 15 SP6 | haproxy | Affected |
| openSUSE Leap 15.4 | haproxy | Affected |
| openSUSE Leap 15.5 | haproxy | Affected |
| openSUSE Leap 15.6 | haproxy | Affected |
| openSUSE Leap Micro 5.3 | haproxy | Affected |
| openSUSE Leap Micro 5.4 | haproxy | Affected |
| openSUSE Leap Micro 5.5 | haproxy | Affected |
SUSE Timeline for this CVE
CVE page created: Thu Oct 22 12:57:12 2026CVE page last modified: Thu Oct 22 14:53:45 2026