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CVE-2026-9499VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-9499· Medium 6.3

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, 04:33 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 21 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
QtQtAffected
  • >=6.9.0 <6.11.1
Fixed in
  • 6.11.1
QtQtAffected
  • >=6.0.0 <6.8.8
Fixed in
  • 6.8.8
QtQtAffected
  • >=4.0.0 <6.0.0
Fixed in
  • 6.0.0
GitHubqt/qt5compatpkg:github/qt/qt5compatOther threatsAffected
  • =6.0.0
  • =6.9.0
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 updated qt6 RPM packages as part of the Red Hat Hardened Images update to address this vulnerability. Users should apply this update as detailed in the Red Hat advisory. Currently, no alternative mitigations meeting Red Hat's criteria for ease of use and applicability are available.

Description

CVE-2026-9499 is an out-of-bounds read vulnerability in the Qt framework's QTextCodec::codecForName() function. It occurs when processing specially crafted input that is not properly terminated, potentially causing the application to select an incorrect text encoding or crash, resulting in denial of service. This flaw does not lead to sensitive information disclosure. Red Hat has released an update for Red Hat Hardened Images RPMs including qt6 packages to address this issue. No mitigations meeting Red Hat's criteria are currently available.

References

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