CVE WatchSep 16, 2026

CVE-2026-76151

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

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 16, 2026 · Last modified: Sep 16, 2026 · CWE-125 · CWE-197

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

codereview.qt-project.orghttps://codereview.qt-project.org/c/qt/qtbase/+/752129

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