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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.

PUBLISHED Reserved 2026-04-09 | Published 2026-04-10 | Updated 2026-04-10 | Assigner VulDB




MEDIUM: 4.8CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
LOW: 3.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:ND/RL:OF/RC:C

Problem types

Inefficient Algorithmic Complexity

Denial of Service

Product status

1.2.0
affected

1.2.1
affected

1.2.2
affected

1.2.3
affected

1.2.4
affected

1.2.5
affected

1.2.6
affected

Timeline

2026-04-09:Advisory disclosed
2026-04-09:VulDB entry created
2026-04-09:VulDB entry last update

Credits

0x001 (VulDB User) reporter

0x001 (VulDB User) analyst

References

www.openwall.com/lists/oss-security/2026/04/09/19

vuldb.com/vuln/356620 (VDB-356620 | musl libc GB18030 4-byte Decoder iconv.c iconv algorithmic complexity) vdb-entry technical-description

vuldb.com/vuln/356620/cti (VDB-356620 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/796352 (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

cve.org (CVE-2026-6042)

nvd.nist.gov (CVE-2026-6042)

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