glibc 2.18-2.31 iconv Hang via BIG-HKSCS Input
CVE-2026-122054 Published on November 4, 2026
BIG-HKSCS decoding hang on crafted input
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.
Vulnerability Analysis
CVE-2026-122054 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is an Infinite Loop Vulnerability?
The program contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. If the loop can be influenced by an attacker, this weakness could allow attackers to consume excessive resources such as CPU or memory.
CVE-2026-122054 has been classified to as an Infinite Loop vulnerability or weakness.
Products Associated with CVE-2026-122054
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Affected Versions
The GNU C Library glibc:- Version 2.18, <= 2.31 is affected.