Client application crash via oversized Cache-Control header
Published Sep 16, 2026 · Updated Sep 16, 2026
Out-of-bounds read in Qt Framework 6.0.0 through 6.8.8 and 6.9.0 through 6.11.1 allows remote attackers to crash client apps. The QtNetwork Cache-Control response parser reads beyond its buffer when QNetworkAccessManager processes an excessively large header value. Exposure requires a 64-bit client application to fetch from an untrusted or compromised HTTP server; the read-only access causes no disclosure or code execution.
Summary
What happened
Out-of-bounds read in Qt Framework 6.0.0 through 6.8.8 and 6.9.0 through 6.11.1 allows remote attackers to crash client apps. The QtNetwork Cache-Control response parser reads beyond its buffer when QNetworkAccessManager processes an excessively large header value. Exposure requires a 64-bit client application to fetch from an untrusted or compromised HTTP server; the read-only access causes no disclosure or code execution.
The record
- CVE
- CVE-2026-76151
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- The Qt Company
- Product
- Qt Framework
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.0.0 <6.8.9
- Affected versionversion=6.9.0 <6.11.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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