CVE-2026-76151
Description
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.
How to fix
- qt qt6.8.9, 6.11.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| qt qt | 6.0.0 ≤ v < 6.8.9, 6.9.0 ≤ v < 6.11.2 | 6.8.9, 6.11.2 |
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Attack Surface Management
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