CVE catalog

CVE-2026-6042

Severity: Medium · CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Apr 10, 2026, 9:00:18 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.24% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	musl	sid	`1.2.6-1`	fixed
Debian	musl	forky	`1.2.6-1`	fixed
Debian	musl	trixie	`1.2.5-3.1~deb13u1`	fixed
Debian	musl	bookworm	`1.2.3-1`	vulnerable
Cpe	musl	Not reported	Not reported	vulnerable
Alpine	musl	3.19	`1.2.4_git20230717-r6`	fixed
Alpine	musl	3.20	`1.2.5-r2`	fixed
Alpine	musl	3.21	`1.2.5-r10`	fixed
Alpine	musl	3.22	`1.2.5-r11`	fixed
Alpine	musl	3.23	`1.2.5-r22`	fixed
Alpine	musl	3.24	`1.2.6-r1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	musl	source	sid	`1.2.5-3.1`	not yet assigned	Not reported	[1133372]
Debian	musl	source	forky	`1.2.5-3.1`	not yet assigned	Not reported	[1133372]
Debian	musl	source	trixie	`1.2.5-3.1~deb13u1`	not yet assigned	Not reported	[1133372]
Debian	musl	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1133372]
Alpine	musl	apk	3.19	`1.2.4_git20230717-r6`	Not reported	ALPINE-CVE-2026-6042	Not reported
Alpine	musl	apk	3.20	`1.2.5-r2`	Not reported	ALPINE-CVE-2026-6042	Not reported
Alpine	musl	apk	3.21	`1.2.5-r10`	Not reported	ALPINE-CVE-2026-6042	Not reported
Alpine	musl	apk	3.22	`1.2.5-r11`	Not reported	ALPINE-CVE-2026-6042	Not reported
Alpine	musl	apk	3.23	`1.2.5-r22`	Not reported	ALPINE-CVE-2026-6042	Not reported
Alpine	musl	apk	3.24	`1.2.6-r1`	Not reported	ALPINE-CVE-2026-6042	Not reported

[Debian bug #1133372]

Notes

[bookworm] musl: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[musl]Affected
Details (2)
- 1.2.3-1 · amd64 · bookworm
  Affected
  nvd · musl · debian · bookworm; nvd · musl · debian · 12
- 1.2.3-1 · arm64 · bookworm
  Affected
  nvd · musl · debian · bookworm; nvd · musl · debian · 12
[musl-dev]Affected
Source package: [musl]
Details (2)
- 1.2.3-1 · amd64 · bookworm
  Affected
  nvd · musl · debian · bookworm; nvd · musl · debian · 12
- 1.2.3-1 · arm64 · bookworm
  Affected
  nvd · musl · debian · bookworm; nvd · musl · debian · 12
[musl-tools]Affected
Source package: [musl]
Details (2)
- 1.2.3-1 · amd64 · bookworm
  Affected
  nvd · musl · debian · bookworm; nvd · musl · debian · 12
- 1.2.3-1 · arm64 · bookworm
  Affected
  nvd · musl · debian · bookworm; nvd · musl · debian · 12

[Debian 13 (Trixie)]

[musl]Fixed
Details (2)
- 1.2.5-3.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1.2.5-3.1~deb13u1
  nvd · musl · debian · 13
- 1.2.5-3.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1.2.5-3.1~deb13u1
  nvd · musl · debian · 13
[musl-dev]Fixed
Source package: [musl]
Details (2)
- 1.2.5-3.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1.2.5-3.1~deb13u1
  nvd · musl · debian · 13
- 1.2.5-3.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1.2.5-3.1~deb13u1
  nvd · musl · debian · 13
[musl-tools]Fixed
Source package: [musl]
Details (2)
- 1.2.5-3.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1.2.5-3.1~deb13u1
  nvd · musl · debian · 13
- 1.2.5-3.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1.2.5-3.1~deb13u1
  nvd · musl · debian · 13

Observed: Oct 23, 2026, 10:34:23 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]