How severe is CVE-2010-1766?

CVE-2010-1766 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2010-1766 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-1766?

CVE-2010-1766 primarily affects Digia Qt. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-1766?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2010-1766 published?

CVE-2010-1766 was published on 2010-07-22 and last updated on 2026-06-16.

CVE-2010-1766

CVE-2010-1766 is a high-severity vulnerability in Digia Qt with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Digia Qt
Published: 2010-07-22
Last modified: 2026-06-16

Description

Off-by-one error in the WebSocketHandshake::readServerHandshake function in websockets/WebSocketHandshake.cpp in WebCore in WebKit before r56380, as used in Qt and other products, allows remote websockets servers to cause a denial of service (memory corruption) or possibly have unspecified other impact via an upgrade header that is long and invalid.

Frequently asked questions

What is CVE-2010-1766?: Off-by-one error in the WebSocketHandshake::readServerHandshake function in websockets/WebSocketHandshake.cpp in WebCore in WebKit before r56380, as used in Qt and other products, allows remote websockets servers to cause a denial of service (memory corruption) or possibly have unspecified other impact via an upgrade header that is long and invalid.
How severe is CVE-2010-1766?: CVE-2010-1766 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2010-1766 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-1766?: CVE-2010-1766 primarily affects Digia Qt. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-1766?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2010-1766 published?: CVE-2010-1766 was published on 2010-07-22 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:digia:qt:*:*:*:*:*:*:*:*
cpe:2.3:a:webkit:webkit:*:*:*:*:*:*:*:*

More vulnerabilities in Digia Qt

CVE-2015-1860 — Medium (CVSS 6.8): Multiple buffer overflows in gui/image/qgifhandler.cpp in the QtBase module in Qt before 4.8.7 and 5.x before 5.4.2…
CVE-2015-1859 — Medium (CVSS 6.8): Multiple buffer overflows in plugins/imageformats/ico/qicohandler.cpp in the QtBase module in Qt before 4.8.7 and 5.x…
CVE-2015-1858 — Medium (CVSS 6.8): Multiple buffer overflows in gui/image/qbmphandler.cpp in the QtBase module in Qt before 4.8.7 and 5.x before 5.4.2…
CVE-2015-0295 — Medium (CVSS 5.0): The BMP decoder in QtGui in QT before 5.5 does not properly calculate the masks used to extract the color components,…
CVE-2013-4549 — Medium (CVSS 5.0): QXmlSimpleReader in Qt before 5.2 allows context-dependent attackers to cause a denial of service (memory consumption)…
CVE-2010-2621 — Medium (CVSS 5.0): The QSslSocketBackendPrivate::transmit function in src_network_ssl_qsslsocket_openssl.cpp in Qt 4.6.3 and earlier…

All CVEs affecting Digia Qt →

Other CWE-189 (Numeric Errors) vulnerabilities

CVE-2015-8396 — Critical (CVSS 10.0): Integer overflow in the ImageRegionReader::ReadIntoBuffer function in…
CVE-2015-7205 — Critical (CVSS 10.0): Integer underflow in the RTPReceiverVideo::ParseRtpPacket function in Mozilla Firefox before 43.0 and Firefox ESR 38.x…
CVE-2015-6575 — Critical (CVSS 10.0): SampleTable.cpp in libstagefright in Android before 5.1.1 LMY48I does not properly consider integer promotion, which…
CVE-2015-3864 — Critical (CVSS 10.0): Integer underflow in the MPEG4Extractor::parseChunk function in MPEG4Extractor.cpp in libstagefright in mediaserver in…
CVE-2015-3836 — Critical (CVSS 10.0): The Parse_wave function in arm-wt-22k/lib_src/eas_mdls.c in the Sonivox DLS-to-EAS converter in Android before 5.1.1…
CVE-2015-3834 — Critical (CVSS 10.0): Multiple integer overflows in the BnHDCP::onTransact function in media/libmedia/IHDCP.cpp in libstagefright in Android…

Browse all CWE-189 (Numeric Errors) vulnerabilities →