BIG-HKSCS decoding hang on crafted input

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-122054
StatePUBLISHED
Assignerglibc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 18:17:43 UTC
Updated2026-11-04 19:17:39 UTC
DescriptionConverting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from 3ff69d7a-14f2-4f67-a097-88dee7810d18

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

Problem Types: CWE-835 | CWE-835 CWE-835 Loop with unreachable exit condition ('infinite loop')

VersionSourceTypeScoreSeverityVector
3.13ff69d7a-14f2-4f67-a097-88dee7810d18Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The GNU C Library Glibc affected 2.18 2.31 custom Not specified

References

ReferenceSourceLinkTags
sourceware.org/git 3ff69d7a-14f2-4f67-a097-88dee7810d18 sourceware.org
www.openwall.com/lists/oss-security/2026/11/04/10 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
sourceware.org/bugzilla/show_bug.cgi 3ff69d7a-14f2-4f67-a097-88dee7810d18 sourceware.org
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: Tom Honermann (en)

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