musl libc GB18030 4-byte Decoder iconv.c iconv algorithmic complexity

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Summary

CVECVE-2026-6042
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-10 09:16:25 UTC
Updated2026-04-10 10:16:04 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 4.8 MEDIUM from [email protected]

CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-404 | CWE-407 | CWE-407 Inefficient Algorithmic Complexity | CWE-404 Denial of Service

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary4.8MEDIUMCVSS: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/C...
4.0CNADECLARED4.8MEDIUMCVSS: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
3.1[email protected]Secondary3.3LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED3.3LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
3.0CNADECLARED3.3LOWCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
2.0[email protected]Secondary1.7AV:L/AC:L/Au:S/C:N/I:N/A:P
2.0CNADECLARED1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:ND/RL:OF/RC:C

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Musl Libc affected 1.2.0 Not specified
CNA Musl Libc affected 1.2.1 Not specified
CNA Musl Libc affected 1.2.2 Not specified
CNA Musl Libc affected 1.2.3 Not specified
CNA Musl Libc affected 1.2.4 Not specified
CNA Musl Libc affected 1.2.5 Not specified
CNA Musl Libc affected 1.2.6 Not specified

References

ReferenceSourceLinkTags
vuldb.com/submit/796352 [email protected] vuldb.com
www.openwall.com/lists/oss-security/2026/04/03/2 [email protected] www.openwall.com
www.openwall.com/lists/oss-security/2026/04/09/19 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
www.openwall.com/lists/oss-security/2026/04/02/10 [email protected] www.openwall.com
vuldb.com/vuln/356620/cti [email protected] vuldb.com
vuldb.com/vuln/356620 [email protected] vuldb.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: 0x001 (VulDB User) (en)

CNA: 0x001 (VulDB User) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-09T00:00:00.000ZAdvisory disclosed
CNA2026-04-09T02:00:00.000ZVulDB entry created
CNA2026-04-09T19:58:49.000ZVulDB entry last update
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