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CVE-2026-6042— musl libc GB18030 4-byte Decoder iconv.c iconv algorithmic complexity

Quick assessment

Affected
musl libc
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.

musl libc是musl开源的一款开源的C语言标准库。主要用于嵌入式系统与移动设备等。 musl libc 1.2.6及之前版本存在安全漏洞，该漏洞源于算法复杂性低效，可能导致本地攻击。

CVSS 3.3 · Low EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-6042

Vulnerability Information
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Vulnerability Title
musl libc GB18030 4-byte Decoder iconv.c iconv algorithmic complexity
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in musl libc up to 1.2.6. Affected is the function iconv of the file src/locale/iconv.c of the component GB18030 4-byte Decoder. Performing a manipulation results in inefficient algorithmic complexity. The attack must be initiated from a local position. To fix this issue, it is recommended to deploy a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
musl libc 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
musl libc是musl开源的一款开源的C语言标准库。主要用于嵌入式系统与移动设备等。 musl libc 1.2.6及之前版本存在安全漏洞，该漏洞源于算法复杂性低效，可能导致本地攻击。
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
musl libc 1.2.0 -

II. Public POCs for CVE-2026-6042

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III. Intelligence Information for CVE-2026-6042

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Vendor Advisories for CVE-2026-6042 (1)

Mailing List Discussions for CVE-2026-6042 (2)

IV. Related Vulnerabilities

Same weakness: CWE-407