Vulnerability in Musl Libc
CVE-2026-6042
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. T…
EPSS: 0.000 (0.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C.
Affected products
- Musl Libc — versions 1.2.0, 1.2.1, 1.2.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- VDB-356620 | musl libc GB18030 4-byte Decoder iconv.c iconv algorithmic complexity (vdb-entry, technical-description)
- VDB-356620 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #796352 | musl libc musl 0.8.0 - 1.2.6 Inefficient Algorithmic Complexity (third-party-advisory)
- www.openwall.com/lists/oss-security/2026/04/02/10 (related)
- www.openwall.com/lists/oss-security/2026/04/03/2 (patch)
Frequently asked questions
- What is CVE-2026-6042?
- CVE-2026-6042 is a low-severity vulnerability in Musl Libc, classified under Inefficient Algorithmic Complexity. CVSS score: 3.3/10. Published 2026-04-10.
- How severe is CVE-2026-6042?
- Low severity. CVSS v3 base score is 3.3 out of 10.
- Is CVE-2026-6042 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.