Bug 2535100 (CVE-2026-76151)

Summary: CVE-2026-76151 qt5-qtbase: qt6-qtbase: qt: Denial of Service via excessively large HTTP Cache-Control header
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the QtNetwork module of the Qt Framework. This out-of-bounds read vulnerability allows a remote attacker to cause a denial of service (application crash). This occurs when an application using QNetworkAccessManager processes an excessively large HTTP Cache-Control header value from an untrusted or compromised server. The vulnerability affects only the client side of the connection and results in read-only access, with no information disclosure or code execution.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2556122, 2556123, 2556124    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-16 10:19:48 UTC 
Out-of-bounds read (buffer over-read) in the HTTP Cache-Control response header parsing in the QtNetwork module in Qt Group Qt 6.0.0 through 6.8.8, and 6.9.0 through 6.11.1, allows remote attackers to cause a denial of service (application crash) via an excessively large Cache-Control header value returned by an untrusted or compromised HTTP server to an application using QNetworkAccessManager. Only the client side of the connection is affected and 32-bit builds are not affected; the out-of-bounds access is read-only, with no information disclosure and no code execution.