What’s Vulnerable › Vulnerabilities
CVE-2026-76151: Out-of-bounds read (buffer over-read) vulnerability in HTTP Cache-Control response header parsing impacts Qt Framework (QtNetwork module)
- Severity: medium (CVSS 4.6 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-16 · updated 2026-09-18
- Weakness: CWE-125
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.
Affected products
- Qt: from 6.0.0 before 6.8.9; from 6.9.0 before 6.11.2 — fixed in 6.11.2, 6.8.9
How to fix
Upgrade to a fixed version: Qt 6.11.2, 6.8.9. Check the vendor advisory for mitigations.
References
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