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

Quick assessment

Affected
qt Qt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Qt 5 兼容性 API 模块（即 Qt 5 及更早版本中的 Qt Core）中，基于 iconv 的 QTextCodec 编码功能存在越界写入漏洞。在特定条件下，使用 QTextCodec 对文本进行编码时，可能会将数据写入内部缓冲区之外。这可能导致应用程序崩溃，并影响数据完整性。

CVSS 1.9 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-107590

Vulnerability Information
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Vulnerability Title
Out-of-bounds write vulnerability in QTextCodec iconv-based encoding impacts Qt
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
qt Qt 4.5.0 ~ 6.8.8 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-107590

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-107590

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Other References for CVE-2026-107590 (2)

Same Patch Batch · qt · 2026-10-27 · 3 CVEs total

CVE-2026-105946 5.3 MEDIUM Out-of-bounds read vulnerability in NTLM authentication handling impacts Qt
CVE-2026-107472 4.3 MEDIUM Out-of-bounds read vulnerability in QTextCodec TSCII encoding impacts Qt

IV. Related Vulnerabilities

Same product: Qt
Same vendor: qt
Same weakness: CWE-787