# CVE-2026-6042: musl: A security flaw has been discovered in musl libc up to 1.2.6

CVE-2026-6042 is fixed in musl on 1 platform, first by DEBIAN-CVE-2026-6042, released April 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-6042
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 10, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | musl Debian 13.5 (trixie) | 1.2.5-3.1~deb13u1 | [DEBIAN-CVE-2026-6042](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6042.md) | Apr 10, 2026 |
| Linux | musl Debian 14 | 1.2.5-3.1 | [DEBIAN-CVE-2026-6042](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6042.md) | Apr 10, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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