Low 1.9Published Oct 27, 2026

CVE-2026-107590Out-of-bounds write vulnerability in QTextCodec iconv-based encoding impacts Qt

Updated under an hour ago (Oct 29, 2026, 2:00 AM ET)

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It affects Qt and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

An out-of-bounds write vulnerability in the Qt QTextCodec iconv-based encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier) impacts Qt. Under certain conditions, encoding text with QTextCodec may write outside an internal buffer. This can cause the application to crash and may affect data integrity.

CVSS: 1.9 LOW (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/R:U/RE:L/U:Green
Weakness (CWE): CWE-787, CWE-131
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Qt
NVD analysis: Awaiting Analysis
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 27, 2026

Affected products

Affected products

qt Qt qt:qt	before 4.5.0 not affected; from 4.5.0 through 6.8.8; from 6.9.0 through 6.11.2	CNA record
qt Qt qt:qt5compat	before 4.5.0 not affected; from 4.5.0 through 6.8.8; from 6.9.0 through 6.11.2	CNA record
qt Qt qt:qtbase	before 4.5.0 not affected; from 4.5.0 through 6.8.8; from 6.9.0 through 6.11.2	CNA record

References

References

https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-107590:	vendor-advisory
https://codereview.qt-project.org/c/qt/qt5compat/+/762752	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.