Red Hat Security Advisory: qt security update
Affects Red Hat qtSource GCVE Database
Not known to be exploited · CVSS 6.3 Medium · fixed in Red Hat package updates : update Red Hat qt5compat when convenient.
Data as of 6 Nov 2026, 04:32 UTC
- Patch
- Available – fixed in 6.11.1, 6.8.8, 6.0.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 21 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade Qt to 6.11.1 or 6.8.8; Qt to 6.0.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| QtQt | Affected
| Fixed in
|
| QtQt | Affected
| Fixed in
|
| QtQt | Affected
| Fixed in
|
GitHubqt/qt5compatpkg:github/qt/qt5compatOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Red Hat has released a security update for the Qt packages in Red Hat Enterprise Linux 7 Extended Lifecycle Support that addresses this vulnerability. Users should apply the official update as described in the Red Hat advisory (RHSA-2026:74444) to remediate the issue. No additional mitigation steps are indicated or required beyond applying the update.
Description
A denial of service vulnerability exists in the Qt toolkit used for GUI applications on the X Window System. The issue is caused by an out-of-bounds read in text codec handling, identified as CVE-2026-9499. Red Hat has issued a security advisory for this vulnerability affecting Red Hat Enterprise Linux 7 Extended Lifecycle Support. The update addresses the flaw to prevent potential denial of service conditions.