Upstream information

CVE-2026-33555 at MITRE

Description

An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received body length matches a previously announced content-length when the stream is closed via a frame with an empty payload. This can cause desynchronization issues with the backend server and could be used for request smuggling. The earliest affected version is 2.6.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail CNA (MITRE) SUSE
Base Score 4 4
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack Vector Network Network
Attack Complexity High High
Privileges Required None None
User Interaction None None
Scope Changed Changed
Confidentiality Impact None None
Integrity Impact Low Low
Availability Impact None None
CVSSv3 Version 3.1 3.1
CVSS v4 Scores
CVSS detail SUSE
Base Score 6.3
Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Attack Vector Network
Attack Complexity Low
Attack Requirements Present
Privileges Required None
User Interaction None
Vulnerable System Confidentiality Impact None
Vulnerable System Integrity Impact None
Vulnerable System Availability Impact None
Subsequent System Confidentiality Impact None
Subsequent System Integrity Impact Low
Subsequent System Availability Impact None
CVSSv4 Version 4.0
SUSE Bugzilla entry: 1262103 [IN_PROGRESS]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
Container suse/sl-micro/6.0/baremetal-os-container:latest
  • libxslt1 >= 1.1.38-7.1
Image SLE-Micro
Image SLE-Micro-Azure
Image SLE-Micro-BYOS
Image SLE-Micro-BYOS-Azure
Image SLE-Micro-BYOS-EC2
Image SLE-Micro-BYOS-GCE
Image SLE-Micro-EC2
Image SLE-Micro-GCE
  • libexslt0 >= 1.1.38-7.1
  • libxslt1 >= 1.1.38-7.1
SUSE Linux Enterprise High Availability Extension 15 SP6
  • haproxy >= 2.8.11+git0.01c1056a4-150600.3.12.1
 Patchnames:
SUSE-SLE-Product-HA-15-SP6-2026-1568
SUSE Linux Enterprise High Availability Extension 15 SP7
  • haproxy >= 2.8.11+git0.01c1056a4-150600.3.12.1
 Patchnames:
SUSE-SLE-Product-HA-15-SP7-2026-1568
SUSE Linux Enterprise High Availability Extension 16.0
  • haproxy >= 3.2.15+git64.0fc44b458-160000.2.1
 Patchnames:
SUSE-SLES-HA-16.0-632
SUSE Linux Enterprise Server for SAP applications 16.0
  • haproxy >= 3.2.15+git64.0fc44b458-160000.2.1
 Patchnames:
SUSE-SLES-16.0-632
SUSE Linux Micro 6.0
  • haproxy >= 2.8.11+git0.01c1056a4-3.1
 Patchnames:
SUSE-SLE-Micro-6.0-683
SUSE Linux Micro 6.1
  • haproxy >= 2.8.11+git0.01c1056a4-slfo.1.1_3.1
 Patchnames:
SUSE-SLE-Micro-6.1-503
SUSE Linux Micro 6.2
  • haproxy >= 3.2.15+git64.0fc44b458-160000.2.1
 Patchnames:
SUSE-SL-Micro-6.2-632
openSUSE Leap 16.0
  • haproxy >= 3.2.15+git64.0fc44b458-160000.2.1
 Patchnames:
openSUSE-Leap-16.0-632
openSUSE Tumbleweed
  • haproxy >= 3.3.6+git91.af5637e93-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-10581

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 Released
SUSE Linux Enterprise High Availability Extension 16.0 haproxy Released
SUSE Linux Enterprise Micro 5.3 haproxy Not affected
SUSE Linux Enterprise Micro 5.4 haproxy Not affected
SUSE Linux Enterprise Micro 5.5 haproxy Not affected
SUSE Linux Enterprise Server 16.1 haproxy Affected
SUSE Linux Enterprise Server for SAP applications 16.0 haproxy Released
SUSE Linux Enterprise Server for SAP applications 16.1 haproxy Affected
SUSE Linux Micro 6.0 haproxy Released
SUSE Linux Micro 6.1 haproxy Released
SUSE Linux Micro 6.2 haproxy Released
openSUSE Leap 15.6 haproxy Released
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Availability Extension 12 SP5 haproxy Not affected
SUSE Linux Enterprise High Availability Extension 15 SP4 haproxy Not affected
SUSE Linux Enterprise High Availability Extension 15 SP5 haproxy Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 haproxy Not affected
Products past their end of life and not receiving proactive updates anymore.
SUSE Linux Enterprise High Availability Extension 15 SP6 haproxy Released
openSUSE Leap 15.4 haproxy Not affected
openSUSE Leap 15.5 haproxy Not affected
openSUSE Leap Micro 5.3 haproxy Not affected
openSUSE Leap Micro 5.4 haproxy Not affected
openSUSE Leap Micro 5.5 haproxy Not affected

SUSE Timeline for this CVE

CVE page created: Mon Apr 13 20:10:19 2026
CVE page last modified: Tue Apr 28 22:54:42 2026