qt6-base: Out-of-bounds read (buffer over-read) in the HTTP Cache-Control response header parsing in the QtNetwork module in Qt...
CVE-2026-76151 is fixed in qt6-base on 1 platform by DEBIAN-CVE-2026-76151 (version 6.11.2+dfsg-5), released October 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| qt6-base · Debian 14 | 6.11.2+dfsg-5 | DEBIAN-CVE-2026-76151 | Oct 4, 2026 |
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