Red Hat Qt 5 Updates Address CVE-2026-9499
Tech GuruQuick Answer
Red Hat's Qt 5 updates address CVE-2026-9499 in text-codec name handling. The listed fixes are qt5-qtbase 5.15.9-11.el9_4.1 for RHEL 9.4 SAP E4S and 5.15.9-11.el9_6.1 for RHEL 9.6 EUS. Use the build for the host's entitled branch; these are not interchangeable packages for any RHEL 9 system.
Confirm Scope And Apply The Supported Fix
What to do now: Inventory RHEL 9.4 SAP E4S and RHEL 9.6 EUS Qt 5 qtbase packages, match the exact affected release or feature, apply the authority-supported fixed build or service remediation, validate the dependent workflow, and preserve evidence.
Source recheck: October 2, 2026 UTC, against Red Hat's structured CSAF advisory. The dates above distinguish initial issue from current CSAF generation. Confirm repository entitlement and installed/running package state locally before closing the change.
Scope And Authority
| Product scope | RHEL 9.4 SAP E4S and RHEL 9.6 EUS Qt 5 qtbase packages |
|---|---|
| Advisory | RHSA-2026:70562 / RHSA-2026:70561 |
| CVE | CVE-2026-9499 |
| Authoritative release date | RHSA-2026:70562: 2026-09-23T08:16:00+00:00 RHSA-2026:70561: 2026-09-23T07:10:46+00:00 |
| Authority revision date | RHSA-2026:70562: 2026-10-01T23:41:08+00:00 (CSAF current generation) RHSA-2026:70561: 2026-10-01T23:41:09+00:00 (CSAF current generation) |
| Affected versions | The exact entitled RHEL 9.4 SAP E4S and RHEL 9.6 EUS Qt 5 qtbase packages builds before the branch-specific fixed packages listed by Red Hat |
| Fixed version | qt5-qtbase 5.15.9-11.el9_4.1 or 5.15.9-11.el9_6.1 |
| CVSS base score | 7.5 (CVSS v3.1) |
| CVSS severity | High |
| Exploitation status | Not stated by the authority; no exploitation claim is inferred. |
What Changed
An improperly terminated input to QTextCodec::codecForName() can cause a read beyond the intended boundary, selecting the wrong text encoding or crashing the application. Red Hat explicitly says this flaw does not disclose sensitive information. Applicability therefore involves the application's input path and loaded Qt library, not just the presence of a graphical desktop.
What To Validate Now
- Inventory. Record the entitled RHEL branch, architecture, qt5-qtbase package build and applications that load it, including application-bundled Qt copies that may not use the system package.
- Establish applicability. Compare each deployment with the authority's affected-version statement: The exact entitled RHEL 9.4 SAP E4S and RHEL 9.6 EUS Qt 5 qtbase packages builds before the branch-specific fixed packages listed by Red Hat Do not infer applicability from product family or severity alone.
- Remediate. Apply qt5-qtbase 5.15.9-11.el9_4.1 or 5.15.9-11.el9_6.1 through the supported vendor or project channel, following the current advisory and change-control requirements.
- Validate. Follow each application's restart procedure so it uses the updated library, then test normal text-encoding and file-import workflows in staging. Confirm loaded-library provenance; do not use malformed input against a production SAP client.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Use the exact supported release stream and repository. Test dependencies, clusters, integrations, and rollback before broad deployment; a CVSS rating or reachable feature is not evidence of exploitation.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
