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CVE-2026-76151

qt · Vulnerability

CVSS 4.0 4.6 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-76151

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-76151

Published

qt

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "qt",
                    "product": "qt",
                    "repo": "https://code.qt.io/cgit/qt/qtbase.git",
                    "modules": [
                        "qtbase"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "6.0.0",
                            "lessThan": "6.8.9",
                            "versionType": "python"
                        },
                        {
                            "status": "affected",
                            "version": "6.9.0",
                            "lessThan": "6.11.2",
                            "versionType": "python"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON