Upstream information
Description
Missing validation of the outer content_type byte on TLS 1.3 encrypted records in s2n-tls allows an active man-in-the-middle to silently discard individual application data records without either endpoint detecting the modification. RFC 8446 Section 5.2 requires that the outer content_type of all encrypted TLS 1.3 records must be application_data (0x17). The s2n-tls AEAD implementation hardcodes this value in the additional authenticated data rather than using the actual wire byte, so the outer content_type is not covered by the authentication tag.This enables selective suppression of application data. In HTTP pipelining scenarios, dropping a TLS record containing an HTTP request can cause request/response desynchronization, where subsequent responses are delivered to the wrong requests. In write-heavy workloads, a dropped record containing a write request can result in undetectable data loss when the client interprets a subsequent success response as confirmation of the dropped write.
All TLS 1.3 connections are affected. Both TLS clients and servers are affected. TLS 1.2 and QUIC connections are not affected.
We recommend you upgrade s2n-tls to version v1.7.6
SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (Amazon) | SUSE |
|---|---|---|
| Base Score | 6.5 | 6.5 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L |
| Attack Vector | Network | Network |
| Attack Complexity | High | High |
| Privileges Required | None | None |
| User Interaction | None | None |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | High | High |
| Availability Impact | Low | Low |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | CNA (Amazon) |
|---|---|
| Base Score | 8.3 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| Attack Vector | Network |
| Attack Complexity | Low |
| Attack Requirements | Present |
| Privileges Required | None |
| User Interaction | None |
| Vulnerable System Confidentiality Impact | None |
| Vulnerable System Integrity Impact | High |
| Vulnerable System Availability Impact | Low |
| Subsequent System Confidentiality Impact | None |
| Subsequent System Integrity Impact | Low |
| Subsequent System Availability Impact | None |
| CVSSv4 Version | 4.0 |
List of released packages
| Product(s) | Fixed package version(s) | References |
|---|---|---|
| openSUSE Leap 16.0 |
| Patchnames: openSUSE-Leap-16.0-packagehub-452 |
| openSUSE Tumbleweed |
| Patchnames: openSUSE-Tumbleweed-2026-11492 openSUSE-Tumbleweed-2026-11526 |
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 Performance Computing 12 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP7 | aws-efs-utils | Affected |
| SUSE Linux Enterprise Server 15 SP7 | aws-efs-utils | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | aws-efs-utils | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP5 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 12 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP4 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP5 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 12 SP5 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 15 SP4 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | aws-efs-utils | Affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | aws-efs-utils | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Enterprise Storage 6 | aws-efs-utils | Not affected |
| SUSE Enterprise Storage 7 | aws-efs-utils | Not affected |
| SUSE Enterprise Storage 7.1 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP1 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP2 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP3 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Module for Public Cloud 15 SP6 | aws-efs-utils | Affected |
| SUSE Linux Enterprise Server 12 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 12 SP3 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 12 SP4 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 15 SP1 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 15 SP2 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server 15 SP3 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | aws-efs-utils | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | aws-efs-utils | Not affected |
| SUSE Manager Proxy 4.0 | aws-efs-utils | Not affected |
| SUSE Manager Proxy 4.1 | aws-efs-utils | Not affected |
| SUSE Manager Proxy 4.2 | aws-efs-utils | Not affected |
| SUSE Manager Proxy 4.3 | aws-efs-utils | Not affected |
| SUSE Manager Retail Branch Server 4.0 | aws-efs-utils | Not affected |
| SUSE Manager Retail Branch Server 4.1 | aws-efs-utils | Not affected |
| SUSE Manager Retail Branch Server 4.2 | aws-efs-utils | Not affected |
| SUSE Manager Retail Branch Server 4.3 | aws-efs-utils | Not affected |
| SUSE Manager Server 4.0 | aws-efs-utils | Not affected |
| SUSE Manager Server 4.1 | aws-efs-utils | Not affected |
| SUSE Manager Server 4.2 | aws-efs-utils | Not affected |
| SUSE Manager Server 4.3 | aws-efs-utils | Not affected |
| openSUSE Leap 15.3 | aws-efs-utils | Not affected |
| openSUSE Leap 15.4 | aws-efs-utils | Not affected |
| openSUSE Leap 15.5 | aws-efs-utils | Not affected |
| openSUSE Leap 15.6 | aws-efs-utils | Affected |
SUSE Timeline for this CVE
CVE page created: Thu Jul 23 11:30:54 2026CVE page last modified: Tue Sep 1 11:29:40 2026