CVE-2026-76151
Received
Received - Intake
Out-of-Bounds Read in QtNetwork HTTP Cache-Control Parsing
Vulnerability report for CVE-2026-76151, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-16
Last updated on: 2026-09-16
Assigner: TQtC
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| qt_group | qt | From 6.0.0 (inc) to 6.8.8 (inc) |
| qt_group | qt | From 6.9.0 (inc) to 6.11.1 (inc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-197 | Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion. |
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
