Bug 2457266 (CVE-2026-6042)

Summary: CVE-2026-6042 musl libc: GB18030 4-byte Decoder: musl libc: Denial of Service via inefficient algorithmic complexity in iconv
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in musl libc, specifically within the `iconv` function of the GB18030 4-byte Decoder component. A local attacker can exploit this vulnerability by performing a specific manipulation, leading to inefficient algorithmic complexity. This can result in a Denial of Service (DoS) due to excessive resource consumption, impacting system availability.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2457412, 2457413, 2457414    
Bug Blocks:    

Description OSIDB Bzimport 2026-04-10 10:01:31 UTC
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.