Vulnerability · Published Oct 27, 2026 · Assigned by Qt
CVE-2026-107590Out-of-bounds write vulnerability in QTextCodec iconv-based encoding impacts Qt
Low 1.9
In plain English
A low-severity out-of-bounds write in Qt from qt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 4.0)1.9Low
Exploit odds (30 days)0.1%top 98.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | qt6-5compat | no fix listed | DEBIAN-CVE-2026-107590 |
| Debian:13 | qt6-5compat | no fix listed | DEBIAN-CVE-2026-107590 |
| Debian:14 | qt6-5compat | no fix listed | DEBIAN-CVE-2026-107590 |
| Debian:12 | qtbase-opensource-src | no fix listed | DEBIAN-CVE-2026-107590 |
| Debian:13 | qtbase-opensource-src | no fix listed | DEBIAN-CVE-2026-107590 |
| Debian:14 | qtbase-opensource-src | no fix listed | DEBIAN-CVE-2026-107590 |
| Ubuntu:22.04:LTS | qt6-5compat | no fix listed | UBUNTU-CVE-2026-107590 |
| Ubuntu:24.04:LTS | qt6-5compat | no fix listed | UBUNTU-CVE-2026-107590 |
| Ubuntu:26.04:LTS | qt6-5compat | no fix listed | UBUNTU-CVE-2026-107590 |
| Ubuntu:26.10 | qt6-5compat | no fix listed | UBUNTU-CVE-2026-107590 |
Affected products (as reported)
Weakness: CWE-787, CWE-131 · Vector: 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