5.9 Medium

CVE-2026-122054 BIG-HKSCS decoding hang on crafted input

Description

Converting 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.

CVSS 3.1 detail

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

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: High
Privileges required: None
Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
glibc 2.18	2.18 → 2.31	No fix stated

References

sourceware.org sourceware.org
sourceware.org sourceware.org

Timeline

Published November 4, 2026
Last modified November 4, 2026

The 35 CVEs of glibc →

CVE-2026-84243 The gettext family of functions in the GNU C Library version 2.0 and later accept LANGUAGE environment variable… 7.0 High CVE-2026-97399 The strncasecmp function in the GNU C Library 2.24 and later optimized for the Power8 architecture may read one byte… 3.7 Low CVE-2026-95818 A stack-based buffer overflow in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44… 3.6 Low CVE-2026-86805 A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc)… 6.3 Medium

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