CVE-2026-4046— iconv crash due to assertion failure with untrusted input
Quick assessment
Affected
The GNU C Library glibc
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.
GNU C Library是GNU社区的一种按照LGPL许可协议发布的开源免费的C语言编译程序。 GNU C Library 2.43及之前版本存在安全漏洞，该漏洞源于iconv函数在转换IBM1390或IBM1399字符集输入时可能因断言失败而崩溃，可能导致远程崩溃应用程序。
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| The GNU C Library | glibc | 2.3.3≤ 2.43 |
affected |
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I. Basic Information for CVE-2026-4046
Vulnerability Information
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Vulnerability Title
iconv crash due to assertion failure with untrusted input
Source: CVE Program / CVE List V5
Vulnerability Description
The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application.
This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
GNU C Library 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU C Library是GNU社区的一种按照LGPL许可协议发布的开源免费的C语言编译程序。 GNU C Library 2.43及之前版本存在安全漏洞，该漏洞源于iconv函数在转换IBM1390或IBM1399字符集输入时可能因断言失败而崩溃，可能导致远程崩溃应用程序。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| The GNU C Library | glibc | 2.3.3 ~ 2.43 | - |
|
II. Public POCs for CVE-2026-4046
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: glibc
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CVE-2026-97399
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CVE-2026-8674
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CVE-2026-80489
EUC_JISX0213 decoding may hang on crafted input
Same vendor: The GNU C Library
-
CVE-2026-97399
One-byte overread in strncasecmp on Power8 -
CVE-2026-95818
AT_SECURE program buffer overflow via $ORIGIN processing -
CVE-2026-86805
AT_SECURE programs may load attacker-controlled code via $OR -
CVE-2026-8674
Assertion failure in the DNS stub resolver with a long searc -
CVE-2026-80489
EUC_JISX0213 decoding may hang on crafted input
Same weakness: CWE-617
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V. Comments for CVE-2026-4046
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